If you sleep well on planes ...
Then ORD gives you the longest beauty rest almost 1/2 hour more
Plus customs on reentry seems best at ORD (easy and not a lot of flights landing at same time, but my recollection may be dated. I have sped thru faster enough to shower and take an earlier flight from ORD)
YMMV, of course.
That being said, AA via LAX gives an extra 2 hours+ of napping