What, no Infinity? Anyways, SG-1 by far. It is definitely one of the best sci-fi shows ever, though it did get kind of weak in the final few seasons (especially all that Ori stuff and the endless Baal clones). Atlantis started off strong, but then squandered almost all of its potential. The final three seasons were almost entirely set in the same section of Wraith ship corridor. They introduced some tantalising story potential (like the rag-tag group of space nomads that appear in all of two episodes, and the evil Asgard) and then just ignore it in favour of more "sneak around on Wraith ships." Universe was terrible. They tried to make a replacement for Battlestar Galactica, and it just fell on its face because it derped all over everything Stargate stood for. In the last half of the last season the show started getting tolerable, bordering on decent, and they choose [i]then[/i] to cancel it.