I did the same comparison 10 years ago on a diesel powered Cary. I chose Arnesons at that time because Pulse were just beginning and they didnít have a large prop selection, and they only had their long thin drive that looked ugly.
I now have a 38 Scarab with 800ís and Pulse Driveís maneuverability is much better than Arnesonís. The housing gives protection over the prop and the new drives look a lot cleaner than before. One of the best aspects of the Pulse Drive is that they have few moving parts, and all the parts are made of composite or stainless steel.
The only down side to date is the perceived value loss. I have spent close to $300,000 on this boat since I had it. If I sold it now Iíd be lucky to get $150,000. However, Iíd be looking at the same scenario regardless of what drive system I chose. I could have spent a lot more for #6 drives and I would still be looking at taking a loss on the sale.