Please be more specific with what fan you have your eye on. There was a range of fans ('94-'95 GT/Cobra, '94-'95 V6, '96, then another in '97 IIRC.......... and so on).
I can say the 94-95 GT/Cobra fan works well. They had an issue with the fan connector melting when high speed shorted out, so check the connector for charring.
The 94-95 GT/Cobra fan is very similar to the 3.8L Taurus fan in terms of performance IMHO.
The Mark VIII is nice but much thicker. Unless you really need it, I'd actually go with a thinner profile fan (the two others mentioned). As I recall, the Mark VIII fan motors are pricier too (if you need to replace one).
Good luck.