I would choose TOS. The original series was classic. And, the uniforms were better than other sci fi series(see Lost in Space) as well as the Star Trek sequels.
I liked all the other series(including the 3 Discovery seasons and Picard) except Deep Space Nine. That one had story lines that were not as interesting as the others. I would even give Enterprise the nod over Deep Space Nine. And, most people say Enterprise was the worst.
I also like all the movies without exception that were made by Rodenberry and Berman. The ones made since by JJ Abrams or whoever I do not think are as good.
My 2 cents on all things Star Trek – although I might have gotten off the uniform track.