Even with a steam deck, I am probably going to get the Switch2, mostly because I can lower my head on in-game profiteering, which is increasingly prevalent on steam games.
My impression is that the general quality of games on the Switch (or Switch 2 or eShop) is sub par the quality of, e.g. Zelda. This is obviously because Zelda is a landmark title and it doesn't make sense to compare it with "the general quality" of games on Steam. It would make more sense to compare it with the quality of other landmark titles on Steam e.g. Baldur's Gate 3.
You can compare the general quality of games on Steam (which includes games like "Hentai Waifu 5") with the general quality of games on Switch (which includes games like "Hentai Waifu 5"), though I'm not sure it is that interesting of a comparison, since no one buys the "average" game but what they consider to be the best games on the platform.
I'd suspect that any attempt at an "objective" comparison (obviously, an impossible task) would land in favour of Steam simply because it has basically all of (core) gaming for most of history on it. Though obviously such an "objective" comparison would be meaningless for something like this where literally your subjective opinion should matter the most for your choice.