Transparency: I have worn Whoop 4.0 daily since 2024, so the Whoop section is based on first-party use and my own data. I have not used the Oura Ring, Garmin or Withings devices — those sections are based on manufacturer specifications, datasheets and published product documentation, and contain no measurements of my own. More on methodology
I’ve worn Whoop 4.0 daily for over a year. That’s the one device in this comparison I can speak about from the inside. The rest is a specification and cost comparison — because the honest answer to “which wearable is best” is “it depends on what job you’re hiring it for”, and that question can be answered from spec sheets and prices.
Here’s the complete rundown.
What Fitness Wearables Actually Can (and Can’t) Do
Before we compare: let’s calibrate expectations.
What modern wearables do reasonably well:
- HRV as a night-to-night recovery trend
- Resting heart rate trend over weeks
- Activity recognition
- Sleep duration and rough sleep-stage estimates
What they can’t do:
- Make medical diagnoses
- Match a sleep lab on sleep staging — consumer stage estimates are useful as trends, not as ground truth
- Accurately measure blood oxygen (trend yes, absolute no)
- Estimate calorie burn precisely (error margins are wide on every device)
- Determine hydration status
- Measure cortisol or other hormones
Know these limits, and you can benefit enormously from the data. Ignore them, and you’ll be frustrated.
The Candidates
Whoop 4.0
Best for: Athletes, performance optimisers, people who take recovery seriously
Cost: Device free, membership from $239/year (~$19.92/month)
What it does:
- Continuous HRV tracking (overnight + daytime)
- Daily Recovery Score 0–100%
- Strain Score (daily load)
- Sleep analysis
- Respiratory rate
- No display — app only
My 12+ month experience: The Recovery Score is startlingly consistent with how I actually train. On low-score days I feel the difference under the bar, even when I think I feel fine going in. The biggest value isn’t any single metric — it’s having HRV as a decision framework for training intensity instead of guessing.
What annoys me: the subscription model, and the absence of a display is occasionally inconvenient.
Oura Ring Gen 3
Best for: People who want discreet tracking, sleep-focused users, anyone who won’t wear a wrist device at night
Cost: Ring from €349 + membership €6/month
What Oura specifies:
- Sleep tracking with stage estimates
- HRV, resting heart rate, continuous skin temperature
- Readiness Score (Oura’s counterpart to Whoop’s Recovery Score)
- Activity recognition
- Ring form factor — nothing visible on the wrist
Structural advantages over Whoop:
- Cheaper subscription (€6/month vs Whoop’s ~$20/month)
- Finger placement, which is stable overnight and not strap-dependent
- Looks like ordinary jewellery
- Skin temperature tracking, which Whoop’s band does not surface the same way
Structural weaknesses:
- Strain and training-load modelling is less developed than Whoop’s
- No active workout guidance
- A ring is awkward under gloves and during barbell work — a form-factor limitation, not a software one
- Subscription still required for the full app
Garmin (Forerunner / Fenix Series)
Best for: Endurance athletes, runners, triathletes, GPS users
Cost: €300–800 one-time (no subscription)
What it does:
- GPS tracking (runs, cycling, hiking)
- HRV Status (a nightly summary rather than continuous tracking)
- Body Battery (Garmin’s proprietary recovery score)
- VO2max estimate
- Full smartwatch: weather, notifications, music
When Garmin is the right choice: You train for races, need GPS, want a display on your wrist, and refuse subscriptions. For pure recovery tracking, Garmin’s model is less developed than Whoop’s or Oura’s — but for anything with a route and a finish line it’s the obvious pick.
Withings (ScanWatch 2 / Body Smart)
Best for: Health-conscious users, hybrid-watch fans, data minimalists who want no subscription
Cost: €250–€500 one-time (no subscription)
What it does:
- Hybrid smartwatch with an analogue dial (looks like a real watch)
- ECG and SpO2, CE-certified as medical device functions
- Sleep apnea screening, cleared as a medical function — unusual at this price
- Up to 30 days battery life (manufacturer figure)
- Body Smart scale: weight, body fat, muscle mass, water composition
- Health Mate app with long-term trends, no subscription required
When Withings is the right choice: You want a watch that looks like a watch but delivers regulator-reviewed health functions. No display overload, no subscription lock-in. Especially strong for anyone who wants ECG or sleep apnea screening. Weaker on training-load modelling — there’s no Whoop-style strain score.
→ Withings ScanWatch 2 at Withings* | Withings Body Smart Scale*
Direct Comparison
Feature presence and published figures, not quality ratings — no independent head-to-head accuracy study covers these four devices.
| Criterion | Whoop 4.0 | Oura Ring Gen 3 | Garmin Forerunner 265 | Withings ScanWatch 2 |
|---|---|---|---|---|
| Cost year 1 | ~€200/year | €349 + €72/year | €350 once | €300 once |
| Ongoing cost | Subscription only | €72/year | None | None |
| Recovery / strain model | Full (Recovery + Strain) | Readiness score | Body Battery | None |
| Sleep stage estimates | Yes | Yes | Yes | Yes |
| Continuous HRV | Yes (day + night) | Nightly + spot | Nightly | Nightly |
| Skin temperature | Yes | Yes | No | No |
| ECG / sleep apnea (certified) | ❌ | ❌ | Partial | ✅ |
| GPS | ❌ | ❌ | ✅ | Connected |
| Display | ❌ | ❌ | ✅ | Hybrid (small) |
| Worn at night comfortably | Yes | Yes | Bulky | Yes |
| Battery (manufacturer) | 4–5 days | 4–7 days | 7–14 days | up to 30 days |
| Subscription required | ✅ | Partial (€6/mo) | No | No |
My Recommendation By Profile
You want to seriously optimise recovery and train 4+ times/week: → Whoop 4.0 — the one I actually use. No other device in this list builds its whole product around the recovery/strain loop, and after a year that loop is what changed how I train. The subscription is the real cost; go in knowing it.
You won’t wear a band and care most about sleep: → Oura Ring Gen 3 — discreet, comfortable at night, and the €6/month membership is a third of Whoop’s. Less developed on training load. If the subscription is the sticking point, see the subscription-free ring alternatives.
You run, cycle, or do triathlon: → Garmin Forerunner 265 — irreplaceable for GPS-based sport. One-time cost, no subscription.
You want a classic watch look with certified health functions and no subscription: → Withings ScanWatch 2 — the only device here with CE-certified sleep apnea screening. Hybrid design, 30-day battery, no lock-in. Weakest on strain and recovery modelling.
You want everything: → Garmin for training + a ring for sleep and recovery. Costs more, covers both jobs properly.
The Bottom Line
No wearable will make you fitter. What it does: give you data to make better decisions. Whether to train or not. Whether to sleep earlier. Whether that drink was really worth it.
Most people underestimate how valuable that is — until they start taking their data seriously. And the device that delivers that is usually the one you’ll actually wear every day, not the one with the best spec sheet.
Affiliate disclosure: Amazon links contain my referral tag. Whoop links are direct. Whoop is the only device in this comparison I use personally.
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