You will get all sorts of answers depending on individual likes and dislikes. Personally, I like arriving ASAP and do not mind waiting in the terminal. My son loves it and never was a problem in that sort of situation, unlike some other kids. Of course, I never get to wait in line at security since I use the
DCL shuttle from MCO.
If I had to wait for an hour outside the terminal to get through security, I would choose to arrive after 11:30. If I was staying at WDW, I would probably use Uber/Lyft with a pickup around 10:45. But since you didn’t get to pick a PAT at first when you checked in, maybe the early PATs are now gone, resulting in you getting a high boarding group anyway.