If you drain the oil and it happens to be clean enough to go back in after winter, be sure to put it through a strainer as it goes back in. You would be amazed at the bits of road grit that drop into the drain bucket when draining the oil. This is after attempting to clean the engine before draining. I find these particles on the strainer cloth.
I have one twin with a ball valve shut off on the oil line, no electrical switch, it relies on a different type of ignition cutout.
It is the easiest of the bunch to live with, no wet sumping, no farting around draining, straining and refilling.
I found that letting the sumps all fill to the top over winter caused lots of messy leakage.
Bikes that stay dry during the riding season seem to squirt oil everywhere once that sump fills up during winter storage.
Glen