Not getting the appeal of Rift Hop. If it was a bit stronger, maybe, but as is, it doesn't seem appealing enough to me. It's taking up my Ghost STAB moveslot and giving me a move that's even weaker than Shadow Claw, which itself is mediocre as a STAB move. I really would rather run Shadow Claw + U-turn to Rift Hop because it achieves the same general result without quite as bad of STAB. No STAB on U-turn, true, but that's a small price to pay, IMO, since the point of U-turn isn't to do massive amounts of damage anyway, but rather to just give a hit as you switch out and to scout predicted switches.
The entry hazard thing isn't even a factor to me, as you have to switch in CAP7 to take advantage of it, meaning it will have to take full damage from them first. Plus, CAP7 isn't a tank, so it can't keep switching it in to take advantage of it, meaning you won't get too many chances to use it. Thus, the gain from it won't be that much, especially if you have to switch to a Pokemon like Lucario to deal with what your opponent has out at the time, which will just take 2% less damage from Stealth Rock.
Shadow Strike, however, fixes up an actual problem that this thing has: poor Ghost STAB, by giving it a better option than Shadow Claw. This will allow it to be more threatening, which I feel to be more important than giving it a STAB U-turn that's weaker than one of it's other STAB moves. Plus, it will also help it scout better in the same moveslot, with the chance of causing switches due to the defense drop.
Thus, I'm going with Shadow Strike.