well, it definatly depends on what your plans are for the car. the maftpro is an awesome computer, with tons of features, and it's really not expensive if you look at what else is offered and their options compared with the maftpro's.
i believe it was drjonez who said: "The lex afm is going the way of the dinosaur!" and i cannot agree with him more. i switched from the lex afm to the maftpro, and i was blown away right on initial setup. the car ran better, acclelerated more smootly, and just behaved better in general once the m-pro was inststalled with only minor adjustments.
i'll say that the Maft is better. much better. but it would be overkill if you're keeping the car stock (even though with the use of a wideband, you could probably tune another 20 horsepower out of a stock car)
i highly suggest buying any maft/innovate products from drjonez. his service is incredible, and the technical support is second to none!
-shaeff