Well, the S470 is made of wood, for one.

The EDRs are made out of some kind of funky synthetic. Also, the S470 has a quality bridge. The EDRs seem to come with three different bridges: Edge Pro II (don't know anything about it) Lo TRS II (generally considered a poor bridge) and a non locking one.
Looks like the S470 is a better quality instrument. I don't know what your skill level or your budget is, but I'd go with the S470. You'll quickly outgrow the EDR.