Yay me! I finally caved in and bought a Garmin Vivoactive 4s. I still have a Fenix 6s on the way to me but I think it will be too big and thick for my wrists and jumpers, thus it's likely going back.
So far I'm rather happy to be honest. Been wearing it for a few hours and actually got a resting HR that looks realistic, compared to what Fitbit provides me with. I also totally love the maxHR setting and how I can customize HR zones and set an alarm for low HR. Oh yeah, I'm coming from a Fitbit Charge 2. I do prefer the look of the new Fitbit devices, but their app/data analysis/maxHR/custom HR zones is just completely messed up.