If you want to ride everest several times, go there first thing in the am; if you are good with only a couple of rides, I'd go to KS first, as BY FAR more people are heading there first thing. I've tried the "dash to EE to get FPs and meet my party at the entrance to KS, but by the time I get there, The line is up to 20 minutes or so.
However, that may not be the case any longer as I understand they are letting people into AK early and not holding at the TOL, so if you are close to the front of the turnstyles/MB entrances, the slow trickle of people coming through them at opening may give you the extra time to FP EE and meet your party at KS.
This time of year, though, is probably the least crowded you will see, so none of the above probably even matters -- just make sure you get your showtimes right, so you're not stuck at the end of the day with two shows to see and one (same) showtime remaining each.
I would definitely add Flights of Wonder to your show itinerary.