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If both have been maintained properly, and the tanks are in good shape, there is little to choose between a good cast iron DeVilbiss or a Quincy. just be sure you are comparing apples to apples, in that they are the same horsepower. Make sure the 1ph motor has a good size shaft on it, as there will be enough belt tension to snap off anything under an 1 1/8" if they are decent machines. A 1725 rpm motor is much preferable to a 3450, but both can be made to work with the right pulley. If this is a DeVilbiss 230 or 330 pump, you may not find any parts for it. If it's a 44633, 44642, 44643, 223, 432, 445 or 447 pump, you have yourself a good machine, and parts are available. For a comparable quality Quincy, you want a 308, 310, 325, 340, 350, 370 or 390 pump. There are also single stage Quincy's from 216 to 270. These are all heavy-duty pressure lubed compressors, and as good a machine as you will likely find. If it's a QT or QE series Quincy, it is more of an economy minded machine, which, while still decent, is a splash-lubed, reed valve compressor, which lacks the heavy duty design of the QR pressure lubed units. If you plan to run a 5hp compressor at home, you most likely will not be able to do it, due to the inability of household electrical service to meet the demand.
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