Here is a lovely 49 post thread that discusses that for you:
http://www.chess.com/forum/view/chess-openings/anti-sicilians-or-the-open-sicilian
Pros/Cons of Closed vs. Open Scicilian Defense?
Sort:
The open sicilian is the only way for white to maintain his opening advantage. White gets a huge activity and good attacking chances usually. At the same time, open sicilians have big theory.
The closed sicilian is also fine, good for players who want to avoid the early tactical battle. But black has no problem with equalizing.
What are the basic pros/cons of the closed vs. open Scicilian?
Is one rated any better than the other?