I've always played the ProV1 because it spins a bit more, and feels softer off my irons and around the green.
The ProV1x feels harder and seems 'clicky' when I'm pitching, chipping & putting.
Someone who should know, recently said that Titleist switched the make up of its ProV line last year such that the ProV1 now has the ProV1x qualities, and vice versa... AND, since most Titleist Touring Pros have historically played ProV1x, they have now switched to the ProV1(?)...
I suggested to my 'friend' that Titleist wouldn't mess with its industry leading marketing & sales.
Kindly advise... Thanks, Ned