The important part is to just do it. Neither way is superior by much, if at all. As for getting crud off the bottom of the pan, the topsuckers will do as good a job as the drain plug. The drain plug is off to the side and doesn't get everything. The sucker needs a slight bevel on the end of its tube, so it doesn't get everything.

As for the idea that a sucker will create a vacuum inside the engine and get oil off the cylinder walls, that's ridiculous. BTW, it's etc, not ect, for the Latin words et cetera.

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Norm in NJ
Next oil change at 230,000miles