I actually don't know a lot about 15 year old Mustangs. But I know that the third gen's were manufactured in California and painted with a water-based environmentally friendly paint because of CARB laws there. The 90-92 f-bodys got the same paint applied with a turbo-bell system which made it look better but the clear coat still doesn't hold up well. 4th gen camaros were manufactured in Canada where they used the good stuff.
I've seen some fox bodies with great paint and some with not so great, same goes for some ford probe's. But I've definitely seen more rusted out f-bodies than Mustangs. Keep the votes coming guys, this has been really informative. I'm saving up for a Stang GT, but yes, I'm keeping the RS.
P.S. Someone mentioned the 4.6 v8 was a failed platform? I'm not arguing, I was just wondering why it is. My daily driver is an 02 crown vic with the 4.6 so I'd like to hear about it.