[quote name='Thongsy']I think Supernatural is done. Yea, they could bring it back for another season, but I heard the writer for the show died and they just finished a big story arc, which I can't see them topping. Better to go out on top then continue like 24 has.[/QUOTE]
One of the executive producers died about a year and a half ago, and the show isn't "done." It got renewed for a sixth season months ago. But I think you're right about the major story arc ending, as far as I know (I'm a few episodes behind). As far aas which one to watch, I enjoyed Smallville even at its worst ( although the last two seasons have been excellent) but Supernatural is my second favorite show after Lost. I'd suggest both, but if its one or the other, then Supernatural wins hands down.