Hi, bulgariuv, sorry for the delay in replying, I've not been on the forum much recently.
I'm using a Fossil Q Explorist, about £250, was a late 50th birthday present to myself! It's been working well with xdrip and an LG K8 2017 phone for over a year now.
Pebbles can be used, there's a settings page in xdrip for them, I've not tried one myself, but others have got them working fine, but I'm not sure whether there's a particular model you need to get.
I thought having bg and graph on a watch would be a bit gimmicky, but it's turned out to be really useful, being able to have a quick glance at my wrist instead of dragging the phone out, have picked up and stopped a few developing highs and lows I might have missed with the phone alone, so I've found it to be well worthwhile.
Good luck with it!