I still vote both the 3200 & 4200 great in their own way. I have not driven a standard 3200GT, but the AC version is absolutely brilliant and hopefully we will keep her for many years to come. The 4200 and I have only driven the facelift, is as well planted at speed as the AC, maybe a fraction better but not much and I like the CC box on the 4200. My 42 needs the ride height dropping a bit, it's about 15mm higher than the AC and you do notice that in some situations. We have had both cars over the 150 mark and they are both stable, the AC is a fantastic road race car, takes bends at serious speeds without hesitation.
I would definitely not knock either car in favour of the other, they are both very good at what they do...IMHO..!!