Much like riding a motorcycle, shooting is more about the journey than the destination. Unless you are about twenty with better that 20-20 vision, increadable eye-hand coordination, and deep pockets for lots of lessons and practice, you are probably not going to win any major matches.
If the destination (winning) is your only purpose you'd be better off playing the lotto. On the other hand, if you enjoy the people, the challange, and the shooting then all you have to do is pick the gun YOU like to shoot and have fun!
When you open your safe pick the first gun you reach for, the one that "feels" right in your hand. Pick the one you'd select if you were going out shooting for sheer fun rather than to a "match". THAT's the one you will shoot best and enjoy most.