The biggest difference is that if you use the button on the SDS you take advantage of a voltage ramp while the record gets up to speed-a little bit easier on the SAMA.
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I think you would be better off using the motor switch. The SDS will start the motor off at full voltage then ramp down to the preselected running voltage after a few seconds. You don't need to switch the SDS off and on to get this feature. Switching the SDS off and on will cause more stress on the SDS circuitry compared to leaving it on continuously.
im not sure i understand mike's response. the sds is always on while listening. the instructions that came with it says "both the sds and the turntable plugged into it may be turned and off with the sds's power switch", which is how i've used it. having said that, i'll try it the other way for ahwile and see if i notice any difference.