Block time is about 40 minutes, wheels up to wheels down can be as little as 20 of which level flying may be as little as 5-8 minutes. I wouldn't give a second's thought to anything and would simply book the most convenient.

I also wouldn't be concerned about clubs and things like that. There's zero reason to arrive early for a US domestic flight, so you should time yourself to head for the gate, board and head to LAX.