You can't go wrong with either time. We love November because it tends to be a bit cooler (not so humid), but still plenty warm to swim, and we LOVE the Osborne Lights and Christmas decorations. However, October has F&W Festival (went last year for the first time and LOVED it).
While we will likely return again in October vs. November, it's because of DD16's fall break which means less time pulling her out of school. If that weren't an issue, I wouldn't hesitate to return in November.