The dynamo has been very hit and miss with a lot of people. I for one HATED that ball. I literally didn't matter how much oil was on the lane, being that dry or flood or in the middle somewhere, it moved 5 boards. Plugged and drilled with a different layout and the same thing, only 6 boards this time! Spoke with a few people and they had the same thing happen to them with this ball.
As for the AO I think it is a better ball, for me at least, then the dynamo. But in all honesty I think if you are set on a heavy oil ball from lane 1 I would look into the Red Death!!! Ball looks like a real winner!