PNP LTP vs NPN LTP

Hi, In a lot of simulated circuits (restricted to the LTP input, three stage amp genre) I observed that - every other thing being equal - the ones with NPN I/S, and consequently, PNP Vas, perform slightly better than the PNP I/S counterpart.
Not sure if such thing exist in real life circuits, I'm not equipped to detect tiny differences in THD. Is this a common observed phenomen, or only a simulation "mirage" ?
Someone experienced the same thing?
Cheers
J.