> One just has to ask "why?" Atomiswave is cheaper and probably more common.
Indeed. It's arguably easier and more interesting to convert most AW games to run on the Dreamcast (the JAMMA interface on AW emulates the Dreamcast controller, for instance, so there's less work there).
As far as I know you can already pirate all the Naomi games with a properly set up Naomi so this would add the Atomiswave catalog to it. Atomiswave is not more common but it is a lot less of a pain in the ass because it's simple plug and play jamma. As far as I remember the Naomi has games that use more ram than the Atomiswave has so you couldn't port the Naomis over. As for price Atomiswave hasn't been that cheap the past few times I've seen it sell.