Of course you want to go VTEC.
Advantage: 30 extra horsepower and higher rpm performance than non VTEC engine of same size. Being able to blow the doors off of most other civics and seeing their jaws drop in amazement when you do it in a car that came from the factory with what, 92 horsepower?

Disadvantage: a little pricier than a non-VTEC engine. MUST use premium fuel