Here in central Florida
laptops are on almost every boat in marinas
these days. I've only seen one 12 volt desktop PC on a boat and that was an old Prout Snowgoose 37' catamaran
which had the room for it.
I recommend a Laptop as I've seen them get wet ( had to turn it sideways to pour the water
out of it) and you just dry them out and they fire back up again. If they don't a couple of hundred buys it's replacement. If you just use a computer for email
, buy a tablet instead.
I'm surprised this is an actual discussion these days.