I like to wear a watch, so I kind of wish I could get a fitness tracker (with heart rate monitor) that doesn't have a clock on it. I sometimes wear a watch and a fitbit and that just looks stupid.
If you don't mind wearing a big fitness tracker, the Fitbit Blaze has been great in my experience. It's a bit old now, and the new bigger fitbits are the Surge and the Charge 2, but I still love my Blaze.
> the new bigger fitbits are the Surge and the Charge 2, but I still love my Blaze.
The Blaze is newer than the Surge; it's basically a Surge with a color screen and the face detachable from the band (which is much better for charging, as well as making replacing the band practical) but without independent GPS (which means if you want to do run tracking without carrying a phone, the Surge still has an advantage.)
The Charge 2, IIRC, replaced the Charge about the same time as the Blaze was introduced, it's basically the next tier down from the Surge/Blaze.
(Current Blaze and former Surge and before that Flex user.)