I'm interested in a couple different Sanders from an industrial resale shop, but I can't decide which one to get. One is a Delta 52-611 12" disc/6" belt sander and the other is a Wilton belt sander. The delta is about $40 more than the Wilton (I dont know why) but its in a little rougher shape, and the Wilton is in good shape but is only a belt sander.Their both heavy floor model machines. Should I even care about the disc? I'm stuck and could use some help.