I don't think that one is more likely than another to come through once both have gone to wait list but given that 1BRs tend to remain available longer, the list should be shorter. Can you wait list both?
I think it also depends on the resort and the views. For example, a 1 bedroom SV will be easier than a SV studio at RIV, but the PV studio may be just as easy as the 1 bedroom SV....
But, in general, 1 bedrooms are the last to book so I agree the list may be shorter for those all the way around.