I’m currently watching Deep Space 9 for the first time and The Visitor is the best 45 minutes of television I’ve ever watched, so I guess DS9 season 4 even though I’ve only watched a few episodes from it at this point.
I like the Orville more than any current running Star Trek show (and that’s not me saying I hate all modern Trek, I definitely like some of it), but I’d take 90s Trek over Orville, so it’s a bit of a toss up.