Six of one, half a dozen of the other. If you're excited about a club level stay, you'll be very happy with either. If a club level stay is not a thrill for you, you'll be disappointed with both.
JMO, but between these two great resorts, I like GF RPC (Main Bldg.) first, (especially at Xmas!), and then Poly second, and third choice GF Sugarloaf (and I would probably choose just getting a MK view room over Sugarloaf).
Again, just me - they're all wonderful and know you'll have a great time!