Mexican vs Mediterranean Oregano

[Neil O]

(I moved this question from Dough Ingredients to here, Sauce Ingredients.)

I need to buy some dried oregano, but then I saw Mexican oregano on Amazon. When I researched to find out the difference, I discovered they weren't even the same plant! Seems like either might work. But has anyone tried a taste-test? 

[sunnykhan]

also, anyone know  about Italian vs Greek Oregano