Do you sew with your machines? Do you own Singer treadle? If you don't want another treadle because of lack of room, then the Wheeler and Wilson can fit into another Singer cabinet. The Davis is a different story. Seems Davis machines only fit into Davis cabinets and some older Davis only fit into older Davis cabinets. The Davis Vertical Feeds are that way from what I have read.
Right now I have a Damascus and a Mason treadle. My Red Eye is a handcrank. I do sew projects through TreadleOn. The Davis is very old, has fancy irons, says Davis Sewing Machine Co. on the treadle foot iron.