I was given a Virtual Gravity from a buddy who did not like it, and I already owned a Dynamo and both are layed out almost the same pin next to ring and cg stacked or about 4 x 4 and I have had both at 4000ab and at 1000ab. The Dynamo is the stronger ball by a few boards if that matters to you. The shape of the line is different between the two also, the VG has a more abrupt response to the dry than the Dynamo and more direct line into the pocket with less continuation, the Dynamo has a more sweeping line into the pocket and more continuation. I would usually switch to the VG if the Dyno was too much, but I still needed a strong ball, now I keep the VG at 4000ab and the Dyno at 1000ab to really get some separation and to try to match them up to their strengths within MY GAME, so I would say both are good and different, just depends on your game and the conditions that day. Hope this helps.
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Patrick