Point of fact - Kiwis eat both Vegemite and Marmite, and the preference is binary and very strong (no-one likes both equally, that I've ever met) and survives the usual jingoism between Aussies and Kiwis.

I am a Kiwi, and like my mother I've a strong preference for Vegemite, though my father and brother are both Marmite people.

My wife is American, and has converted to being a Vegemite-lover after finally experiencing it correctly (NOT a mouthful on a spoon, like all those "look how disgusting Vegemite is" videos show). We did a blind taste test last time we were in New Zealand, and to my surprise we could both correctly tell Vegemite from Marmite, and both preferred Vegemite - even though it's Australian!

Edit: grammar