Can't talk about a top kart, never owned one, but I've had alot, and I mean alot of Margays. Best kart I've ever owned and ran was a late eighties
lynx, I hadn't gotten too big yet, that thing would fly! Plus you have an option of running the ignite series besides your std 206 classes. Advice is only
a phone call away to set it up.
I don't know much about the Carter, but I have a TopKart Twister. I'm happy with the chassis. One possible drawback with the TopKart is they tend to stop supplying parts for the older models rather quickly. So far I haven't ran into any issues that the aftermarket couldn't take care of though. Margay appears to be very good about supplying parts and info for the older model chassis.