I was a TNG fan, and of some of the TOS episodes. I didn't care much for DS9 or Voyager. "City on the Edge of Forever" was probably the height of TOS. TNG had quite a few good ones, like the Borg ones, or "The Inner Light" which was well done.
If you're going to watch TNG, the first 3 seasons struggled a little to get consistently good. It felt like they were trying to figure out what worked and what didn't, with some of the Gene Roddenberry obsession with space babes and sex in there.
I'm really not happy with most of the movies. TNG ones I mean. Picard went from a logical diplomat into a thrill-seeking rebel from the TV to the movies. It didn't make a lot of sense.