It depends. Personally I prefer watchOS 9, because I think the Smart Stack could have just been a new watch face instead of moving literally every control to put it where control center was. I would like it if they brought an update to make face swipe a toggle because I like to swipe between faces multiple times a day, and I do prefer the black minimalistic look of the apps prior to the update.

All that said I have gotten used to everything, except the useless Smart Stack; but that is user preference.