[quote=@Weird Tales]
Frieza had the best fight, but Cell was the best villain. He was scary and the fact that he had the DNA of all the best fighters made him even more threatening 
[/quote]

I think Freeza was prob the best still, just because he was this giant looming preseance over everything. Cell... well, he popped up, ran away from piccolo because Piccolo didn't wanna finish him off, then becomes perfect due to Vegeta screwing everything up, then tournament and boom, cell gone. Freeza had lots of buildup to him tbh. 

Course I think I'm wearing rose tinted goggles due to TFS freeza being so BA and all that.

I'd also put Buu up there, but man that saga dragged on, and on, and on... xD Though Buu and Mr. Satan is so adorable.