Both Nintendo and Steam Deck have their own perks. Nintendo is sleeker and is more portable, whereas, the console from Valve is more powerful. If you take about raw performance, then there is no competition. Steam Deck is a mini PC with a better CPU, GPU, and storage. Nintendo Switch has a better design, it is sleeker, has detachable controllers, and is inexpensive. That is why, we can not say, one is better than the other, as both the consoles are good in their own way.