This is a very personal one that only you can answer.
We are fortunate in that our Son’s school grant him 10 days leave every 6 or 7 years when we can afford to go back to Florida. We match this up with the October half term week and so end up with 3 weeks for our holiday.
This also suits us perfectly because in that 3 weeks, we get to sample Halloween at Disney including MNSSHP and almost overnight following Halloween, Christmas descends and we can also sample MVRCP. Also at this time we get the EPCOT Food & Wine Festival
You’ll find loads of advice (some helpful) on when to go. Remember though, even when the crowds are high, the parks are great at bringing in additional staff & entertainments so don’t worry that you’ll end up just queuing all day. You’ll still have a good time.
I have used Passporter to help plan our trips before and they have an excellent chart in their “Live Guide” that overlays the Disney charging rates over the calendar, the weather, crowd levels, public holidays and so on. Worth subscribing to view this alone.
Alternatively, there’s a good page on weather levels here