When I got mine, the S3 was the current and best available.
Now it is not. It has worked almost flawlessly ever since I got it.
Only issues I ever had with it were due to app issues and not the clock itself.
The watch only as minor scratches and scrapes from many years of use.
But there are a few features I really like. As always on time display, drop sensor, emergencies, better display, etc. Etc.
Do you think an S5 is a big enough upgrade over an S3. I’m fully aware of asking such a question on a sub dedicated to Apple Watch, will get ONLY biased answers, but I can not think of anything else to ask.