I only watch TOS. I have watched some of each of the others but they’re just not my cup of tea. I do like Gowron though, he’s awesome.
As for Babylon 5, I never got into it. I tried watching a couple of episodes but I never liked it.
I’m about to start watching Farscape, I really like that show. I’ve got all the episodes now. I only ever watched a few on tv. It’ll be good to see them all.