To mirror much of the above, it probably won't matter, so get what you shoot the best.
However, from my own research I've come to see that the deeper penetration of a heavier bullet can sometimes not be a good thing. The heavier bullet has a lower velocity and may lead to the round not expanding and merely boring through a target like a FMJ round.
On the otherhand some lighter rounds have a tendency to have the velocity to expand well, however lack the mass to penetrate deeply.
I personally like 124gr or 147gr bullets. I have historically carried 147 grain Rangers, or now I am trying out the 124gr standard pressure Gold Dots.
Bottom line: shoot them all, and see what you shoot best. Heck, if you are most accurate and consistent with ball ammo, carry that, as a hit with ball trumps a near hit with hollow points.