Gear S3 LTE/Cellular version is a much better buy.
Nice smart watch when used with LTE cellular service. Enjoy not having to carry my phone around to receive or make calls. Best feature of watch and a lot cheaper than a cellular Apple Watch.
Smart watch features are hit and miss. Step tracking is good. Sleep tracking is bad. Music controls are great along with the ability to store 300 songs on watch and hear them with blue tooth headphones. Downloaded watch faces look great.
Battery life could be better. Only get a little more than a day if using it for my phone. Recommend getting an extra fast charger. You can put watch on charger and listen to stored music without running battery down. Music playback seams to be biggest drain on watch.
All in all a good overall smart watch for LTE/cellular users. If you don't need a cellular watch I recommend a Garmin for better step/sleep/fitness tracking.