Both great platforms, which is better can (and probably will) be argued either way.
I love the Intek's they are definately cheaper (startup costs) and they have the potential for more cubic inch than the vanguard.
Don Gienger G-Team Racing, has built a great Intek v-twin program check it out (
www.g-team.us) or give him a call 701 400 4084. He has plenty of racer references from guys he has built inteks for and guys that have built thier own Intek's using his parts.
If it were me, I would get the Intek and put the $150 you save into mods and kick some grass.