Whoop band, Garmin and firstbeat

Its paid sponsorship/product placement, pure and simple. I've never seen a proper study of the Whoop OHR that rates it highly. Garmin's is also questionable under close scrutiny. It's actually not physically possible to construct an OHR sensor at the wrist with the same responsiveness that electrodes across the chest can measure.

Yes, you have to take any recommendation from an elite athlete with a ton of salt, and even some fitness bloggers, that matter. If they're sponsored by the brand they won't be spending any of their money on the equipment and will be motivated (by contract) to show off their products wherever possible.

thx for your reply, but I don't care about chest VS wirst. During activities everybody uses chest band. I'm talking about rest period, night time, when measure can be ok without moving. In that case Garmin or Whoop are the same for measuring. But does anything change in analysis?

thanx for your reply. Everybody agrees that a Garmin bike computer is ok on the bike, probably the best on the market;

a lot of athlete uses Garmin watch for measuring time, distance, heart...doesn't matter sponsorship. Can we say the same for Whoop on resting period or in the night time? Garmin is so bad?

The Whoop 3/4 sensor is shown to have poorer accuracy when compared to Garmin Elevate 3/4 sensors by unbiased reviewers. If the data in is poor, the data out (training load) will be poor. If they really did not trust Garmin/Firstbeat data, they will have to go with someone who is at least able to capture accurate data via chest strap, someone like Polar?

Paid elite athlete sponsorships also explains the need for Whoop's high monthly subscription.