time to present my important thesis to y'all:

the best part of star trek is tribbles.

tribbles exist in the original series, its animated spinoff, ds9, and the reboot movie.

the reboot movie made kahn white so this completely negates tribble effect.

the original series is antiquated but adorable, and too trite an answer for best series.

the animated spinoff is awful.

ds9 has the most tribbles among the remainder.

QED, ds9 is the best star trek.

no i will not be taking questions