The openness (full arch desktop) of the Steam Deck is also awesome while having a great UI that you never have to leave if you don't want to.
EDIT: I mistakenly called it "fedora desktop", my bad
- The Nintendo software catalog. Sure, you can emulate on the Steam Deck, but it's a chore and far from perfect, and for most people who do it that is piracy.
- The Switch is far less bulky, and has better battery life, less noise. ARM architecture is very well-suited to mobile gaming.
- The docking mechanism is seamless and the dock is included with the device. Games are designed around that functionality specifically, e.g., you won't have controller or display configuration issues on a Switch because it's all pre-configured.
- The price is almost certainly lower.
- You can buy physical game cartridges and resell them, which is a big advantage for fans of physical media.
- The Steam Deck does rely on a lot on its compatibility software with PC games, and while it's mostly a non-issue there it's not by any means a perfect catalog. If you get a Switch, all Switch software is going to work and was made for and tested on a Switch.
Don't get me wrong it is a super cool console and pushes a lot of boundaries, but you don't really 100% know whether a title is going to run the way you want it to on the steam deck.
The switch is a more curated experience, you can pretty much expect every game to run properly, going to put caveat for very heavy graphic cross platform title like the new Harry Potter game, etc.