VGF is not just studios, has two real bed options (only park adjacent resort with this), and has around 25% less studios (75-100 less).
While VGF is not tiny anymore its still one of the smaller resorts.
POLY is around after BLT if I am not mistaken as well and it comes down to how POLY is setup with only studios and a good amount of original buyers who likely trade out to get a 1BR/2BR at some other resort.
Why October? Are you trying to travel during the busiest time of the whole
DVC year? Oct->Dec timeframe?