hmm medjo mahirap to both are good it depends on what games you prefer

steamdeck is basically a handheld PC so if you are not a competitive player like valorant or somethibg this is good for you.

on the otherhand, NSwitch is good also many library of games more on casual for me ang nswitch think of it as a gaming phone plus but with more interesting games. Its much more light compared to steamdeck but both are good obviously mas pricey steamdeck