I think the Ranger Raptor will have the same suspension as the Bronco Raptor, but I don't think it will have a 37-inch tire option or the larger 3.0L motor. If that's the case, then I would be more interested in the Bronco Raptor.
I think a good sign that the US will get the Ranger Raptor is that it has been testing alongside the Bronco Raptor. I don't know why they would be testing them together here in the States if they weren't going to sell it here.