Sicilian Defense is Positional in Nature
Sicilian is my prefered answer to .
I would say its character depends on the variation. The Open Sicilian is very active and causes many action in and around the center, but the Closed Sicilian isn very positional.
If I am White and have 1. e4 c5 on the board, I always go fpr the Open Sicilian, but that is just my personal preference. I prefer to be active instead of passive.