TOS fan, not so much of the other series, though I watched some of TNG.

TOS was pretty solid in the first season, just filled with great episode after great episode. Of those, probably CITY ON THE EDGE OF FOREVER stands above the rest, but really it's a great assortment of entertaining TV. I even liked THE ALTERNATIVE FACTOR, though admittedly one of that season's weaker entries. The second season, nearly as strong, but I'd say that it had more highs and lows than the first season. Some were just outstanding such as THE DOOMSDAY MACHINE, AMOK TIME, THE TROUBLE WITH TRIBBLES, to name a few, while others were a little weaker, IMHO. The 3rd season is a rough one for me, and features the weakest entries in the series by far. Still enjoyable, but I honestly missed the musical themes of the first two seasons a great deal. And the characters sometimes didn't behave quite right at times. But still pretty darn enjoyable.

I enjoyed the crossover episodes from TGN, particularly UNIFICATION.