One of my clients offered to purchase a new iPad for me, I could have gotten a Pro but honestly I lose things like stylus pencils so the thought of paying $100 for one did not appeal to me.
My 64GB Air 2 replaced a 32GB Air and I am very pleased with the performance difference, the screen is beautiful & the extra ram gets rid of safari tab reloading which had become annoying.
Get the Pro if you will use the pencil a lot but if not the Air 2 is still a fine tablet!
Tab reloading was solved via iOS, in 9.3, not by more RAM. My Air 1 doesn't tab reload anymore.