I always see B&M as being the roller coaster equivalent of an Apple computer, and Intamin is more like a PC.
Intamin is a lot more flexible, more open to crazy ideas, some of them turn out great, some turn out crap.
B&M, on the other hand, is much more conservative. The reliability of a B&M coaster is almost always going to be higher than that of an Intamin one. Much like Apple approaches new technologies with extreme caution, so does B&M. No cable lifts, no launches — they'd rather it be reliable and a great ride than gamble to make something potentially extraordinarily fantastic or an unreliable, closed-half-the-time, cable-snapping dud. Example, at SFMM, sure, Green Lantern is an impressive, punch-packing ride, but it malfunctions at least once an hour. Next to it is Riddler's Revenge, which you would be hard-pressed to find broken down, and is also an excellent ride, though perhaps not as jaw-dropping as Green Lantern.
They both have their pros and cons. I say a park should have both.