Robert1893:So what you're saying is that, at the extreme, there's about a 10% difference
It may be more....its been forever since I've used a NIke ball. I just remember my uphill putts with them going noticeably long.
I use 3 different WGT balls regularly....the B-XD, Tour SD, & the Legend GI2SD2. With a given input, the B-XD easily rolls 10% further than the GI2SD2 in almost all situations, at least on champ greens. The Tour SD falls about midway between the two others.
Just my own personal observations. Like everything else WGT, your results may vary.