I think Doris explained this earlier this season — but there are a lot of different Latin dance styles. I agree with Doris who said (please tell me if I'm wrong if it wasn't) that D/W's is more street dance Latin dance while perhaps V/M is a bit more classical with a bit of sauciness.
I think both work given their skill and personalities. And given how close their SD scores have been all season, I think the judges do too. Again, the difference has only been in levels (see GPF for V/M) +GOE on PCS has been on par all season long.
(Which is again why I prefer not to predict who will win).