I decided on the Marcum because I was on my way to the lake and Fleet Farm in St Cloud had them in stock. I went away from the flasher type due to the noise and the comments that they need to be rebuilt due to the mechanical wear. In a small house you can really notice the noise the Vexilar flasher made. The Marcum was easy to set up and adjust, ready to go out of the box.
I see the IDO guys using them successfully, so they have to be good.
By the way, I did catch fish and it was cool to see them come in to hit my lures.