Who is the strongest heavyweight boxer right now?

If "strongest" means "best," than Fury is probably the right answer, for now. His win over Wilder against AJ's loss to Ruiz has probably made him the better bet, both by the "head to head" and the well-rounded "styles make fights" criteria, especially after their respective performances against Klitschko (despite the fact that AJ has otherwise been a little more diligent about fighting top 10 contenders).

AJ's confirmed-vulnerable chin makes him the division's big question mark, right now. He deserves his shot at Fury, but he hasn't really even demonstrated that he holds up to adversity better than Deontay Wilder (whose single loss is certainly less embarrassing). Wilder is out of the running, of course, unless he delivers on his promise to "rise like a pheonix," and some of the rest in the picture could still demonstrate that they deserve to be seriously considered, but it would be the first time.

Presently, I think Fury.

In the few months after his win over Wilder I would have said Fury was no 1 without question. But so much time has passed now that it's not so clear cut. I thought AJ looked very efficient against Pulev. I think we can safely say Fury and Joshua are the 2 best heavies at the moment but we won't really know who is no 1 until they meet, although I favor Fury. 

the white man Fury for sure he almost  Killed wilder  that's why his corner threw  in the towel lol and aj is weak he's  already  lost fury hasn't  and that's real

It’s between Fury and AJ.  Both have different strengths and attributes.  Both have been knocked down and come back to win.  Only Fury hasn’t been defeated.  Both are box office.  If Fury hasnt been doing the training AJ could knock him out.

Tyson Fury is currently the world’s best heavyweight and I don’t think it’s close.

There's no way for me to measure that so I don't know.  But Wilder has the most KO's on his record

Strongest, Joshua. Best, Tyson Fury