I'd say 10-15%, because Wlad has aged. Toughest thing for Wilder is that Wlad's jab could legitimately knock him down or out. Wlad has a nasty, punishing jab and Wilder's soft beard is there to be hit. Wlad would take his time with Wilder, so it would last maybe into the middle rounds.
1%. Normally, I would say 0% but every now and then something profoundly weird happens like with Martinez and Cotto. There's aways the possibility that a light might fall on Klitschko or that he could get high on pain killers and fall asleep in the corner. For that, Wilder get's a 1% benefit of the doubt.