Depends on your tastes. Buffy's first season is not representative of the rest of the series. It takes a while to gain momentum. Farscape starts off strong but it is a little out there. Sometimes you wonder if you are high when you are watching it. With a minor pacing issue in season two, it sticks together well as a story from beginning to end. Buffy is a little different in that each season is an arc unto its own. You could watch a couple of seasons of Buffy and take a break before going back to it. With Farscape, you are going to want to watch the whole thing all the way through.