With what kind of trump holdings is a 4-4 trump fit superior?
The considerations which you describe affect the overall strength of the hand very much more than the playability of the suit. If you have two or three high card losers in your 4-4 fit, where are they going? If your combined holding with partner is sufficient for a play at game, J9xx vs T8xx has a legitimate chance for 2 or even 3 tricks with ruffs when the trump suit, but only a long-shot-con at 2 tricks if not the trump suit. 

That being said, having the preponderance of your high cards in short suits makes a hand feel more balanced.  For example with

S - xxxx
H - ATx
D - K9x
C - QJx


a raise of partner's 1NT opening to 3NT looks like the most descriptive call even playing Puppet Stayman, whereas with

S - QJxx
H - ATx
D - K9x
C - xxx


a Stayman call starts looking more attractive.