I haven't tried ery many products from either line, but I can say that MUFE's eye shadows, especially the mattes, kick MAC eyeshadows' butts. However, MUFE is more pricey, but I find I think they are worth it.
I'm a big fan of Makeup Forever Foundation. I've been using it for over two years now and it's much better than MAC. I have oily skin and when I used MAC it clogged my pores causing me to break out.