Check out Titleist.com. But you answered your own Question the ProV1 spins more than the x prolly higher trajectory as a result of more spin. And also more workability. 

The other guy has a point. (Note: I have a fast swing as well, but this is just my opinion and my performance notes)

I have been using the V1x for a long time to try and keep my long irons straighter.  The less spin keeps the shots straighter.

Last weekend I was playing at a course with really hard green.  The V1x was not giving me any stop, so I switched to the V1 and it was stopping it much better.  The only negative was that if I hit a fade or draw, it was a little worse so I had to adjust for that.

Hope this helps a little.