You have 3 versions to buy so if its the cheapest version, that is the same as the one on the gamepass. Premium just gives you more aircrafts. I play regularly on my XsX and runs great but XsS is a totally different story. Just the free world updates with the base game are like 300GB...it does struggle and stutter, you can read about it online. Unless you cant play it on XsX or the PC, just forget it otherwise you are just going to be annoyed. The map distance loads much slower than on the X, kills the immersion.
In november a new FS is coming out so you can either wait for that (lots of new cool stuff added) or get this one which is on sale quite often nowadays.