I had an '84 Carrera and a '92 964. The 964 was a much better car in many respects: faster, better suspension, better braking, better air conditioning, more stable...the list goes on and on. It will not have the same raw feel of a torsion bar car, but the feel was still incredible once dialed in right. 1992 and newer are the best years.
I have to disagree somewhat with the post above. The 993 is not superior, just different. I happen to really like the looks of the 964, with its classic lines. To each his own.