Really depends what you are looking to do. Street car or street and track? Restomod then RCR and Active are domestic choices. You could get a chassis or kit out of England from SGT or Tornado. CAV out of South Africa will sell you a complete kit and are reasonably priced and Jordy is super patient and helpful with questions. . But spend a lot of time here reading the good bad and ugly of each. I chose a Chassis and suspension from SGT in England, the body from Bill Hough (who built the original bodies for Fran at RCR) and because I am building a replica of a road car, I have scoured the world this forum and fleabay for parts. Money no object, call Andrew at GT40 Gold Parts and get a monoque chassis.
Just depends what your end goal, budget and timeframe....