Just made the switch to 230gr Federal HST's. I was impressed with the reviews I saw of the expansion so that's what I went with.
Winner!Ball 230 grain, because at 20 per second it really doesn't matter.
This is one of the best ammo comparison write ups I've come across
LuckyGunner.com Labs - Tests, reviews and insights into firearms and ammo
Tons of folks swear by Winchester SXT, Federal Hydra-Shok, Federal HST, Hornady Critical Duty, and Speer Gold Dot.
I really like the speer offerings but not every gun will digest them.
Federal HST +P in a full size gun, standard pressure in anything smaller. I have a family member that designs small arms ammo for SOCOM at Crane. According to him that's what the Spec Ops guys went to for missions when they are not constrained by the Hague Accords. It is also what he carries as his personal EDC. If it's good enough for the guys that jump out of helicopters and kill everyone before they hit the ground, then it should work for me.