I've never actually ridden an Intamin, but the b and ms I've been on we're pretty good (Intimidator, Afterburn, Vortex) although Vortex isn't the most comfortable, but of course it has been around for about twenty years and it is a stand up coaster. Intimidator is very fun, it has nice airtime, and even styles your hair for you! Afterburn is very fun, it's action-packed, and goes upside down 6 times.
After all, b and m has invented the invert, floorless, dive, and wing coasters.
Intamin has invented the hyper (I think), giga, strata, and zacspin coasters.