laptop is probably better, I would wait for some others though, Ive never looked at console specs vs laptop specs. But I do imagine the laptop will be much better
I doubt it, even if you have the I7 model it will be hard running it off of the intel GPU. Save the money to build a desktop instead of buying the game.
Yes you can add ram to most any ROG laptops but you may have to buy a new kit depending on how many slots are used with the default 8 gigs. That is a good price for the laptop and the smaller ram won't make much of a difference in games.