First Mountain Bike Help
So due to peer pressure I am going to buy my first mountain bike, well actually trade an extra road bike for one. There is a local guy who has a newer(09) Specialized Hardrock pro with an alivio groupset or an older(07) gary fisher pirahna with deore. If I understood him right the groupsets are for different purposes, utility vs. mountain? They both fit extremely well, but I was wanting some input. I would be using it mostly for commuting and some mountain biking in the winter. I just wanted to know which group would be better suited or if the alivio was actually substantially worse. They both come with the same disc brakes so. Any help would be greatly appreciated.