Ok This is the Best and Worst Sports logo thread
Best:

Sabres logo from the 70's
Worst:

Santa Cruz Banana Slugs, I mean come on, a banana slug?
Interesting question. I think that a lot of older teams didn't really even have "logos" did they? I mean look at the Green Bay Packers (a letter "G"), the Cleveland Browns.the Yankees NY logo is quite simple, though it's timeless and ever-popular.
I kind of like the Tampa Bay Bucs helmet logos.the Atlanta Falcons are kind of cool as well. The Anaheim Mighty Ducks are alright. Notre Dame Fighting Irish have a cool logo (the boxing leprechaun). The more I think about logos, though, the less I'm sure what qualifies as a "logo" or just uniform insignia. For example, the Michigan Wolverines have a cool helmet, but their actual logo is just an "M". Oh well, good topic anyway.