shule1

I think a big part of the reason for most of the grafting onto rootstocks out there is to make the tree semi-dwarf or dwarf. Ungrafted, they'll be standard-sized.

I personally don't think it'll be much more of a gamble than growing F2 hybrid tomato seed, if the varieties are unstable and/or cross-pollinated. Grow several trees and you'll likely find something you like.