i voted october but start my trip the last day of september.
by doing that i hook on to the value season rates for my entire stay.
really enjoy the first 12 days of october so i can go to mnsshhp, food and wine festival, have better weather, less rain, less crowds, still have good park hours as they cut back on the times around oct 13, get to also go to universal for halloween horror nights, and the best part, my kids are in school and i can go solo.....woo hoo..........