For a good description of OP reservations request priorities, go here:
http://www.vacationclub.com/resorts/ps/resortRequests.jsp
Don't know what your home resort is. If it is not a MVCI resort, you will be at the bottom of the priority list when it comes to requesting a unit.
Particularly during the Platinum season, owner usage tends to be so high that there is a yearly rotation of the prime units even among the owners. Marriott does keep track of such things
I happened to be staying there in mid January. For laughs, I checked to see what the rental rate was on the units. Besides the high rates, the other thing I noted was a specific comment that only lower floor rentals were available.
Art