It depends how proficient you are with Windows 11 and how comfortable you would be with using the touch screen for navigating applications. I think it's easy, but that's due to having a lot of experience with Windows and for beginners I would recommend the Steam Deck due to SteamOS Gaming Mode and its ease of use when using our Steam Library.
The battery is impressive! On AAA Games with 17W we're going to get just shy of 3 hours battery life and at 25W we will get 2 hours. We can get up to 9 hours with simple indie titles like Hades 2 and older games from past gens.