I asked the same question on here a few months prior to ordering mine. From the answers I received here and from talking with Paul at Vudoo, I opted for the Ace barrel. I asked Paul what he and the rest of the crew were using on their personal rifles and he stated that most were using the Ace. He did state though, that the deference in accuracy between the Ace and the other barrels they use was very close.
I've had my Vudoo Ridgeback with the Ace barrel and Triggertech Diamond trigger for 4 months now and I'm 100% happy with my purchase. It's a straight up shooter! The accuracy of it went beyond my expectations!
I had the exact same experience