I believe in penetration above all else, with expansion if you can get it along with your penetration. You never know when your bullets may have to pass through an arm or two, possibly a heavy leather coat, wool coat, layers of denim, etc. before they even get to the possible layer upon layer of fat and muscle, and then, finally, perhaps have an opportunity to tear into some deep vital organs or spinal column. I suspect that most hollowpoints would have a bit of a tough time dealing with all of that... especially the light weight ones. Though the 158's look good in that regard.
While 158 gr Gold Dot is a good load for light game, like small deer and smaller animals, I feel very confident in it as a personal defense round, especially during cold months when people are likely to be heavily clothed. And a great many Americans are heavily built (over fed?) as well.
The 158 gr. HydraShok sounds like a goodie, but I haven't tried any. I do often carry Winchester's 145 gr. Silvertip.. especially during hot months when people wear very little in the way of clothing. As far as I'm concerned, any .357 load with a bullet lighter than 145 gr. is out of consideration for me.
Soon Speer will be releasing their announced 135 gr. .357 "SB" (for short-barrel) Gold Dot load. It's likely to have a cavernous hollow point which will certainly expand reliably at moderate to low .357 velocities... as one might expect from a 2" .357 snubby. I wouldn't expect such a bullet to offer very much on the penetration scale, but for use in snubbies during hot summer months, it's likely to be a pretty good load... as is the 135 gr. .38 spl +P Gold Dot for .38 snubbies.
I'm not a CorBon fan, so I would stick with the 145 ST, 158 H-S, and the 158 GD, depending on how you feel about penetration.