I honestly say go with Pearl. You get a lifetime warranty, an extra tom, the option to add on another tom, and an overall better made drumset. If I'm not mistaken, you would also get shallower rack tom depths.
Now as far as sound, my good friend Mike owns the SCA and it sounds amazing. In comparison to the Vision, I noticed the sound of the SCA to be a bit brighter which probably can be attributed to the fact that the VSX includes basswood in it's shells. Whether one sounds better than the other is up to you. I f I were you, I would go back and ask to try out a couple of the drums side-by-side.