In my opinion, you should usually do first the exercise which (a) requires more coordination and (b) activates the greater amount of muscle mass.
As squats fulfil both of those criteria, If I were you, I would do squats first.
Just from a safety point of view, I've never liked the idea of squatting with pre-exhausted thighs - I think it's a recipe for disaster. Leg press is a much more controllable exercise that doesn't require any element of balance.
230 strict press @ 220; bodyweight+187 X 4 dips @ 180; 403 front squat @ 210; 10 000 push-ups.
Ignoring irrelevant credentials since I was 17.