2 reasons. First It’s the cheapest, and second, it has the widest adoption and likely longest expected support life

If your budget is tight, you can do everything the deck would do on your laptop (besides playing handheld).

If you really want one though, I’d say grab a 64gb secondhand for dirt cheap, and then swap the ssd.

also, to note, you could always place the laptop on a coffee table or something at the couch and use a controller