hi mate,
my brother owned a vx 220 turbo for a couple of years and i used it more than him so i can make a pretty good comparison. First of all i would say they are totally different cars, the Vx was great for a summers day on a dry road but in anything other than that i found it very twitchy are quite frankly scary as hell!!!
The zed is a much more relaxed car to drive (albeit a heavy one) although when you do push it, it can be very agile and is a fantastic drivers car.
I would say definitely swap, as fun as the Vx was, its not in the same league as the Zed and to be honest i found the turbo version not as quick as id hoped. On the right road it was awesome but that only happened 5% of the time, the rest of the time the Zed was the quicker car.
Anyway im sure you'll get lots of good advice, this is just my opinion.