I always try to grab an Oga's reservation for 8:15-ish. That way when I emerge around 9pm/park close Galaxy's Edge is virtually empty. It's also lit up very cool and it's a lot easier to hear the background plane noises. It's eerie -- in a very cool way. And lots of lit up light sabers.
Each of their parks are worth visiting just before close for their own reasons.
Edited to add I prefer that timeline for Oga's because the resort busses are still running. Make sure your transportation options are set before sticking around too late!