Flat white Paint vs Polished Aluminum Reflector

I'm looking at the Magnum XXXL vs the Xtrasun Mondo. The Magnum is about $50 more expensive but its slightly bigger and has a polished aluminum finish. The Mondo is flat white paint. Do you guys think the polished aluminum hood will significantly outperform the flat white paint, or is it not that important?

Are they Sealed and i heard that there is a hood out there that has some kinda of special finish that is white. i have the xxxl and love em..... well good luck and GROW HARD!!!!!!

Yes both are sealed. I'm curious as to the difference between polished aluminum and white paint.