Lack of sleep is never good in any calculation. Jet lag, meaning being out of sync with daylight, is a different issue. I have never understood how going sleep deprived to match up with a clock makes sense. For us it is necessary to just crash for awhile no matter what. Unquestionably daylight flights westbound are easier than flying all night eastbound. Also for us lie flat may leave one less physically abused but it doesn't produce a good nights sleep. Most TATL flights are too short to get enough sleep. Maybe a long TPAC it can be done. I envy people who claim they actually sleep in J and go right to activities when then land, if there really are any such people who really do that as opposed to just function as zombies half the time.