Hi all, I'm not sure how useful this will be to anyone else but having been an Apple Watch series 0 owner for a couple of years I've been pondering upgrading to something a bit newer, but was getting a bit confused by what the actual differences are between different generations. So I thought I'd compare spec sheets and Apple's Watch user guide to make a comprehensive list of changes to aid my decision! Having done that, I thought I might as well post it here too in case any else does find the information useful. Note that I haven't bothered including series 0 in the list as I just wanted to document the changes between it and subsequent generations. Also note that the list is cumulative, i.e. every generation includes the new features from the generations above (aside obviously from CPU changes). Series 1 Dual-core processor Full heart rate features Workout playlists Series 2 GPS and GLONASS Water resistant to 50m + water lock 2.22× screen brightness Wake screen on crown up Series 3 GPS Faster dual-core processor W2 wireless chip Galileo and QZSS Barometric altimeter Siri speaks Supports AirPower Bluetooth 4.2* Radio + music streaming Series 3 LTE (requires iPhone 6) 2× storage capacity LTE and UMTS Explorer watch face * Actually the situation with Bluetooth doesn't seem to be as simple as this: scouring spec sheets, it looks like the series 1 has had a silent spec change to include BT4.2 too as of series 3's release in 2017. As far as I can tell, series 2 only ever included BT4.0.