The difference is this:I don't see the difference there. "Man, I want to play a Drizzt type of character. Hey, look, the new tieflings were modeled based on 'why go with Drizzt when you can do this?' Awesome, it looks made just for me!"
The only "Evil" connotation to Drizzt is "Well my race is evil. But I'm a warm fuzzy teddybear with scimitars. How about a hug."
Why play the Gentle Giant, whose only claim to "Ooh cool evil" is that he is of a race that is otherwise evil, when you can play something much darker with a better backstory that's easier for your DM to work into the story (because good drow are a lot harder to come by than tieflings).
Drizzt is a GOOD GUY. Tieflings are, to put it in older terms, CHAOTIC NEUTRAL guy.
So again I'll ask where the similarity is.