Remember Gentlemen, all these Youtube video tests that are using Gel Blocks with Denim are just for "relative comparison" and contain no muscle, bone, arteries & veins, organs, objects in pockets, belts, etc . In other words, they might give adequate comparisons from one load/brand to another in that particular block, but all blocks, guns, temperature, etc. are not exactly the same. Just saying......
No matter how much we test, also pay attention to the Laws of Physics (mass, velocity, foot pounds of energy). While expansion is important, penetration is the next important thing right after shot placement. Since we don't always get to precisely choose where shots are placed, penetration trumps expansion IMO.
I've not shot any of the HST's and I have heard good things about them too, but in 38 spl, my first choice is the BB (#20A) 158 grain +P LSWCHP-GC (1,025 fps from a 2" M60 & 370 ft lbs energy). My second choice is the Speer Short Barrel GDHP 135 grain +P (860 fps from a 2" M60 & 222 ft. lbs of energy). I've not personally tested or shot any HST's so I can't comment on them.
While many here do practice with our EDC gear, situations are not always as we practice, adrenaline is pumping, we are nervous, we need to worry about bystander's, groups, etc. so shot placement is always "iffy".
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