this thread seems inactive, but i'll give it a shot anyway! ds9 is my fave, but god lower decks is a close second! i enjoyed disco season 3 :-)
TOS is classic (mr spock <3) and there are some parts of enterprise that can be enjoyed i guess (mostly because we get some more andorian worldbuilding which i love)
I like the great fan series Star Trek Continues. Very true to the original series. Including 4:3 format, cheap light setting, shadowy walls and a Kirk prone to making speeches.
Hard agree with everyone about Deep Space Nine and Lower Decks! I have this theory that at some point in Strange New Worlds (probably during season 3, but maybe season 2) that they'll bring back the Suliban from Enterprise. I think they could do a lot with them with modern CGI.
Lower decks is awesome! I haven't been able to watch seasons 3 or 4 because they're not available in my country but the first two were very good. I like how it's very Star Trek but also subverts the genre.