You could be opening a can of worms here.
I know that some here (me) believe in the power of vermiculite, while others have stated here uniquivocally that perlite is better for tomatoes.
This is a universal question, that has divided people for ages. It is more contentious than: John Lennon vs Paul McCartney, Boxers Vs Brief, or Paper vs Biodegradable Plastic. The answer to all probably says more about the chooser than choosen.
That being said: I stand wholeheartly with the persecuted vermiculite - be he ever so loamy. I know these action could get me banned for not being so light and breezy, but this is the strength of my faith and conviction!!!!!!
P.S. My tongue is planted fimly in my cheek. Did you notice?