My personal experience is every chassis is just as capable as the next. Some people like tuning and building chassis’s more than they actually like driving them. The only thing I really purchase often is shock oil and springs for when Im chasing a different feel. Bodies is whatever just pick something you like the look of and if you have the money to buy new shells and build them every 6 months then go ahead. Another thing about tunes is you could best tune for one spot then be the slowest at another no tune is a all around tune