i currently own a specialized Stumpjumper and I love the way it feels/rides. Solid performance all around. That said, I rode a friends GT Force 3.0 and while I liked it, it wasn't close to my Stumpjumper. The fit and position of the bike felt totally different and didn't feel very "natural" to me. The specialized bikes just fit better IMO.
My opinion, go try them out for yourself and see what's best for you. Good luck!