If you want heart rate sensors and Android pay is not important for you, then you can go with new Fitbit Versa, it has Fitbit pay but I have not tested Fitbit pay yet so can't say much on it. Versa is less expensive then Fitbit Ionic and it has got all important features.
I had a Pebble Time when I had an iPhone and really liked it. I now have a Pixel and recently purchased a Samsung Gear S3. It just ok. Its a bit on the big side and I was hoping to be able to check my Gmail accounts and maybe respond to the emails. I can't seem to get my Gmail emails to show up only my work Exchange-based emails. Iv looked at the Fitbit Iconic the Asus Zen watch and the
Huawei Watch 2. Both Asus and Huawei watches don't have any type of heart rate sensors. I do think the Samsung Pay feature is kind of cool but not sure it will work with Android Pay like my phone does ( Haven't really tested this). Any suggestions on a pebble-like watch?