You know, if it hadn't been for The Chain and Wolves at the Gate I might have said season 7, but the brilliance or those stories outshine most season 7 moments. So I want to say season 8, but it's not a clear winner.
If I did a marathon watch of season 7, specielly the last few episodes, I would probably be more into season 7, and vice versa. Because it takes me a while to get into the rythm of the different mediums, and right now, I'm into comics. If season 10 was on TV, and I started to watch it, I would have a easier time forgetting the comics.
I'll try to clearify; when I watch a lot of movies for a while, comics, TV and books seem far away. But sometimes I get on a book high, and that's the medium for me. Same with TV and comics. I adapt to one medium, forgetting about the other.
Buffy doesn't really exist for me on TV anymore. SMG isn't necassarily Buffy for me, it's Jeanty's Buffy that Buffy, if you know what I mean. The faces, the voices, it's fading.
But, let's ignore I just said that. Because season 7 was a hard season for me to like before the comics too. I just didn't connect with the characters. I didn't do that much more during season 8 either, but Wolves at the Gate is what makes season 8 stand out. Without it, it would be a much closer race. Specially if I watched Help, or some other emotional episode or scene.
And season 2 & 5 will probably always be my favorite seasons, no matter how many comic seasons they make. So the medium is just a small part of it, but it is affecting my thinking.