The Deck would be fine for what you want, but the Beelink more capable. The Deck would be more portable and therefore useful in that capacity, but it’s all subjective. If you don’t care about the screen, get a refurbished first-gen for a discount, or take your chances and find a used one on eBay. I’ve okay things about the ROG, but SteamOS makes Deck a no-brainer in my mind.