based on an interview with Dean I just watched he said the reason for the change was based on feedback on the red
1. Spin on approach shots was too much (especially with wind)
2. Driver distance was too short.
New ball addresses both of those issues
Same interview also had testing vs the ProV1 (2019 version) and Snell at 115 mph actually beat the ProV1 in ball speed and distance, and then in slower swing speeds it was right there with the ProV1 and a hell of a lot cheaper.
Testing was done at 115, 100 and 85 mph driver speeds, and included Driver, 7I and wedge
i didn't notice any performance difference between red and black when i tried them at the orlando gathering. only difference i saw was in the visuals, and i much preferred the black.
to hear this new mtb-x will be firmer, is kind of a turn-off. the mtb black is on the firmer side of what i prefer. going even firmer than that, i dunno...