Do I need Strava if I have a Garmin?

Not for data. Garmin Connect holds everything Strava does and more, because it has the raw file and the physiological context. You need Strava for people — segments, clubs, kudos and the fact that everyone you train with is there. If that is worth nothing to you, Connect alone is sufficient.

Which is more accurate for calories, Strava or Garmin?

Garmin, and neither is good. Garmin at least has your heart rate, your VO2max estimate and your device-measured data; Strava is often working from a summary. Both routinely overstate energy cost, which is why eating back exercise calories from either one is the most common reason a deficit stops working.

Is Strava Premium worth it if I already have Garmin Connect?

For analysis, no — Connect gives you more for free, and Intervals.icu gives you more still for free. Premium is worth it for segment leaderboards, route planning and the social features. Pay for it as a community subscription, not an analytics one.

Why do Strava and Garmin show different numbers for the same run?

Different smoothing on GPS, different elevation sources, different moving-time thresholds and different calorie models. Garmin computes from the device's own sensors; Strava recomputes some fields from the uploaded track. When they disagree on distance or elevation, Garmin's figure is closer to what the device measured.

Do either of them track weight training usefully?

No. Garmin records a strength activity and on some watches counts sets; Strava accepts it as a duration. Neither tracks load per set, reps in reserve or estimated one-rep max, and neither lets your lifting influence anything it says about your running.

Strava vs Garmin Connect: Which to Actually Use

What Garmin Connect has that Strava does not

The raw file and the physiological context. Connect has your heart rate variability, your sleep, your resting heart rate trend, your VO2max estimate and your training load history in the same place as the run. Strava has the run.

Better load and readiness modelling. Training Status, Acute Load, Training Readiness and Body Battery are a genuinely more sophisticated picture than Strava's Fitness and Freshness, and they are free with the watch.

More trustworthy raw numbers. Distance, elevation and pace come from the device's own sensors and its own smoothing. Strava recomputes several of those fields from the uploaded track, which is why the two disagree, and Connect's figure is the one closer to what was measured.

What Strava has that Connect does not

People. Segments, clubs, kudos, group activity. Connect's social layer exists and is empty. This is a network effect and no feature list defeats it.

Segments as repeatable tests. The same hill, ranked, over years, against yourself and everyone else. It is a genuinely useful longitudinal measure and Connect has no equivalent.

Route discovery. Heatmaps and community routes are better than Garmin's.

Cross-ecosystem neutrality. If you own a Garmin, a Wahoo and a phone, Strava is where they all end up together.

Where both are weak, in the same way

Neither shows its arithmetic. Body Battery, Training Readiness, Fitness, Freshness and Relative Effort are all undisclosed composites. When one disagrees with how you feel, there is nothing to inspect. Why that matters over years of training.

Both overstate energy cost. Estimated burns from either platform routinely run 20 to 30 percent high, and both encourage reading them as a food allowance. What running actually costs, measured properly.

Both treat lifting as a rectangle on a calendar. Garmin will count sets on some watches. Neither holds load per set, reps in reserve, or an estimated one-rep max trend, and neither lets a heavy squat session change anything it says about your running.

The comparison

	Strava	Garmin Connect
Data source	Uploaded activity	Raw device file
Distance and elevation fidelity	Recomputed	As measured
Load model	Fitness / Freshness	Training Load, Status, Readiness
Sleep, HRV, resting HR	No	Yes
Shows its arithmetic	No	No
Segments and leaderboards	Best	No
Social network	The product	Empty
Route planning	Best	Adequate
Works across brands	Yes	Garmin only
Strength logging	Duration only	Sets, shallow
Cost	Free / Premium	With device

Which number to believe

Distance, pace, elevation: Garmin. It is the measurement rather than a reconstruction.
Training load and readiness: Garmin, with the caveat that it is a black box and it underweights lifting badly.
Calories: neither. Treat both as an order-of-magnitude figure and never as a food allowance.
Segment performance over time: Strava, uniquely.
Whether you are fit: neither, really. Both are describing your endurance training only.

What neither of them can tell you

For a runner or cyclist who only does that, this pairing is close to complete. For anyone who also lifts, three decisions fall through the gap between them:

Whether today's session is realistic. That depends on Monday's squat volume as much as on Sunday's long run. Neither system holds both, so neither can answer.

Whether to deload. The signal is lifting volume, endurance intensity and recovery markers together. Garmin has two of the three and weights the third at approximately zero.

What to eat. A week with four heavy lifting sessions and a week without are different energy weeks. How different, in numbers.

None of this is a defect in either product. Both are endurance tools and they are good ones. It is a category gap, and it is what a spreadsheet in a third tab is usually doing. What both halves on one ledger looks like instead.

Two free things worth doing whichever you use: derive your own threshold pace zones rather than accepting the watch's, and check your ramp rate on total endurance minutes. Running easy days too hard is the most common way concurrent training fails, and neither platform will flag it.