I would recommend the LG Sport or LG Urbane 2 LTE (which you can’t get new any more). They both have NFC for Google Pay, GPS, a great speaker, LTE and you can access the sim card slot yourself, amazing screens, and three buttons, which means you can program two of them to start your most frequently used apps: priceless! They won’t continuously monitor your HR out of the box, but I‘d check if there are apps for this.
Before my Urbane LTE, I had the Samsung Gear S. I really loved that watch for the things it DID do, but the Tizen app store is a desert, and hardly any apps were added during the time that I owned my Gear S (a year). I would never ever recommend Tizen to anyone. For Wear OS, there is pretty much an app for anything.
Samsung makes gorgeous hardware, but the software that allows you to customize your watch to your specific needs is what makes these watches so useful.
In regards to Samsung support, I have a different opinion: there was zero support for their crappy charger, which would break after a few months of use. This is all over the internet: it had a flawed design which they refused to admit, making it necessary to rebuy proprietary chargers every few months. Not one Gear S owner did not have this issue, yet nothing was done to rectify the problem.
Tiwatch E and S are great cheaper options, but be aware that they do not have NFC nor speakers. While spme people may not care about the missing speakers, no NFC means no Google Pay.
I am hoping they’ll add those and LTE to a future model.