I don't have any personal experience with either head, however when I was researching heads before I bought my W5's I found over and over that the Brodix MC head was not that good at lower lifts. Peak flow was there but the lower lift numbers were easily beat by other heads. This was actually before the W9's were out so if they've been improved since then I don't know. The only car I know of that has the MC heads is a slug for what it is but that doesn't mean it's the heads fault.