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The two balls (ProV1 vs Costco/Snell/Oncore/Vice whatever) could be 100% identical but with a different logo and the pros would be playing the Titleist ones because they have no reason not to.
Less than 25% of tour players use Titleist clubs.
Something like 80% of tour players use Titleist balls.
So for all the tour players who play Callaway, Nike, TaylorMade, Srixon, etc clubs; but play Titleist balls, it's because they think Titleist balls are the best. If they didn't feel that way, they'd be playing the ball of their sponsor.
What that also tells me is that a lot of brilliant designers and engineers for a number of great golfing companies have tried and failed to be as good as the Titleist Pro V1 family.
I have not a single Titleist club in my bag, but I exclusively play the Pro V1. I have tried a multitude of other balls, including direct market brands, and never found anything as good as a Pro V1. From driver to putter, in my opinion, it's the best there ever was.