Difference about source resistors on Quasi design

Hello world, i'm design on my own pcb the popular quasi nmos350.
i'm confused about source 5watt resistors, i have seen modules with the resistor on vcc- side on drain and modules with source resistor on source
whats the difference?
In quasi designs i know we must connect the source (emitter on BJTs) with resistor to keep the difference on transistors / fets to minimum condition.
in my case the connection output-resistor-drain on down (vcc-) side is helpful.
 

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