@rexus31 is right about phenolic resin technology and tolerances. I think the Tournament set looks nice as well, mixed feedback on the Black set. personally I have always loved the Centennial design, but man they are super expensive now. Since I had a set in stock, i just grabbed the Predator Arcos set, haven't played much, so I can't comment on how they hold up to the new Aramith sets. Dynaspheres seems to change their designs all the time and some strange colour choices, but they are good quality ballsets in my experience.