Dave we are in our second season. Last year my son ran rookie, this year sportsman. You will get many opinions on who is the best but I would suggest, if possible, to support a local builder who will be at the track. That’s what I did and it has worked out well. Anytime I had a question he was there to answer. Same with the Kart I bought from him. Good Luck!
If you are in the New Jersey area you should talk to Jeremy at Action Kart Racing.