I agree with Superhuman, He is absolutely better than Vai in terms of technical ability and speed, but Vai is much more excellent in songwritting and overall guitar awareness.

Here are some awesome songs by Joe Stump:

The killers Instinct
Demon's Eye
The dominance factor

And here are some of his great albums:

Survival of the fastest
Guitar Dominance

--- A little self explanatory album titles and a little cocky though..!!! Enjoy