Marmite (at least in New Zealand) is pretty much just Vegemite with added sugar.
I have a friend doing a PhD in marmite (no, really) who would disagree :) though if true it would probably explain why I prefer it :P I've always found that the texture of vegemite reminds me of a cross between petroleum jelly and wax which perhaps helps to explain my aversion..
The more important thing though is: do you salt your porridge?
Yes, I certainly do---though the most essential ingredient for me is raisins (fresh fruit like rasberries or blueberries would be nice, but it's usually not practicable for me). Yum :)
Those are my principles. If you don't like them I have others.
-- Groucho Marx