Unanswerable poll, because the genre is so wide. How can you compare X-Files to Twilight Zone to Battlestar Galactica to Quantum Leap? All are nominally sci-fi, but are also so different that saying one is 'better' than the other is a dubious proposition, at best.
(also, somewhat amazed, but not really surprised given all the whedonites out there, at all the 'Firefly is the best EVAR!!!!' posts. Yes, the season was great, but I don't think that it is head-and-shoulders above the BSG remake, or Star Trek DS9, or Doctor Who w/ the 10th Doctor.)