Originally Posted by
MDcatV
IME:
push up - takes longer, adaptations last longer. i.e. ftp increase is more sustainable
pull up - much more rapid response in fitness (weeks as opposed to months *for me), but adaptations (might be poor word choice) are not sustainable for more than a few weeks.
So a mixture is probably best, and pushing up is probably best for the 'off season' where you don't want to even come close to risking burnout.