Aside from the differences in velocities, the bullet construction is a lot different. The Stinger has a conventional albeit exaggerated hollowpoint, while the Velocitor has a completely different bullet type. The "hollowpoint" is stamped into the nose of the already copper plated bullet, more like a large dent than a bubbled over cavity like the Stinger.
Ballistically speaking, Stingers shoot flatter because they are in the air for less time, but hit with less energy because their light weight and short for caliber length gives them poor ballistic coefficient. Velocitors start off slower so are in flight longer giving gravity more time to work, thus don't shoot quite as flat as the Stingers, BUT they are a heavier and longer bullet, so they have a much better ballistic coefficient. I have always wanted a rifle that would shoot with Stingers, but have never found one yet, in thirty years of shooting .22's. I shot a few bricks of the Velocitors when they first came out, and found inconsistant accuracy. One lot number would punch some nice groups, the next would be all over the place. I hunted quite a bit with them. They do work well on squirrel and rabbit sized game, expanding a little bit, but not so much as to cause tons of meat damage. I think they would penetrate better on something with a heavier body, expanding gradually as they went, which is exactly what they are designed to do. Stingers just go KAWHOP and they are fully expanded, without a lot of penetration. If you do make a hit on a small critter with one of them, the results can be spectacular.
Personally, I had just as soon shoot the Minimags and forget about both of the other loads. They cost twice as much but don't perform twice as well. The Minimags will average out about half way in between both of these for flatness of trajectory, splat factor, and penetration. UNLESS I had some particular purpose in mind for ammo that would perform better on heavier bodied small game, in which case the Velocitor would get the nod.
I mostly hunt squirrels and rabbits these days, and use subsonic hollowpoints. Don't need the noise and blast of the high velocity stuff, and the extra speed just tears up even more meat than the subs.