I have stayed at both. I have also stayed outer and main at GF. I dislike the outer buildings. I don't want to walk outside to get to the monorail or walk uncovered to the bus stop. I don't want to go outside and walk to the main building to speak to the concierge. Certainly not for the price GF charges for those outer building rooms. I love staying in the main building; it's my second favorite resort behind BWI. So if I'm going to stay at GF; I am paying the extra $$ to stay GF RPC.
The outer buildings, for me, are like going to a good concert or play and buying the cheap seats way at the back. I'm more of an orchestra seat person.