I don't see how anyone can say that Wilder would destroy him with any confidence. He only has an edge over him in terms of experience. AJ is technically better, faster and appears to hit just as hard. Wilder has proved he can go rounds and is durable, but he hasn't really impressed over the last 18 months. He is still very raw and novice like at times. He just isn't fighting anybody who can take advantage of all the mistakes he makes. Joshua would be capable of doing that but obviously until he has a chance to prove his own durability, I'd be hesitant to massively favour him. So for now I think it's a bit of a toss up. Both have massive power so one punch could change the course of the fight more dramatically than in most other fights, but assuming that AJ has durability and fitness on his side, he's practically stronger in every other category. 18 months down the line I think Joshua cleans his clock.