The notion that the lower moving mass of a moving iron type cartridge inevitably makes it superior to a moving coil type is appealing, but there are no real data to support it. I admit that I too find that I like the sound of most moving iron cartridges that I own over an average moving coil, but I don’t claim to know why. If moving mass were the whole story, then there would be nothing but moving iron cartridges in the marketplace. That doesn’t seem to be the case. I don’t own an art9, but on other threads that cartridge has been the subject of heaps of praise from nearly all of its owners. I do own an ART7, and it is a really great cartridge, maybe the best for the money that I know about. On the other hand I highly respect Sound Smith and all of their products. You probably can’t go wrong with either.