I’m doubting any definitive difference between cubes. That’s not to say all cubes are the same, it’s just that no verification process has been endeavored. Face it. Cubes are toys. Our tool is not crafted with the precision of “legitimate” sporting goods. Golf ball assembly is subjected to relentless mathematical assault and the full-force of R&D departments with multi-million dollar budgets. Cubes are spat from slapdash Chinese molds. Even lubrication is ridiculously contentious. Petroleum bases are obviously ghastly for plastic, but everything else is just a handful of viscosity points of separation. Negligible diversity. I use Astroglide. It really comes down to luck of the mold. Even core enthusiasts seem overly rabid (not me). Considering the screw hole is the only moving part, it seems hardware (screws/washers) is the only actual distinction with merit.