The screen is better on the 9, no doubt about it. It has the ECG, the always on screen and all that stuff, but other than 3 or 4 special features and the better screen, they look the same.

The battery life is exactly the same btw :). I love my 9, no doubt about it, but for less 200 euros (in my country) the SE is a steal

The SE 2gen is the best deal on Apple Watch ever. Bought it to my wife, and honestly I don’t see any real benefit on my Watch 9 over the SE