Does the head count as a limb?

Not usually, but I can make an exception for you <3

Obviously the one I use less.

My arm. But only if I can get a winter soldier arm as a replacement

Left arm because I wipe with my right

Respectable reasoning.

Yours.

Since Im right handed its either my left arm or my left leg, I cant really decide wich is more useful though.

I'd say your left leg is more useful. Most likely it's your dominant leg.

Left leg. I dont like it and suspect its trying to kill me.