Sitting around the house I have a Meprolight M21 an Aimpoint Pro and an EO Tech 512. Which should I use for the Tavor? On the one hand the Meprolight would give it the traditional Israeli look but I think I’m more partial to the Aimpoint.

Use what you shoot best with, there is no standard answer.

Are you trying to impress Israeli Soldiers vacationing in the states or enjoy shooting it more?

if you have an aimpoint available I can't see any reason to use something else. Everything else is not as good.