Tough, I base my decision after i sharkscoped or opr'd the flatting guy. Most good players will flat AA/KK to induce shoves especially this deep. Btw, whats up with 26bb shoving utg+2.. Thats new?
Pretty tough spot. I think I would have to begrudgingly call then when it goes all in and he flips over AA/KK you can think "damn, I knew he had that. Why didn't I fold".