Opinions usually are
Since I was the one doing the switching, there was no way to do it blind. But to say "because it's not blind, it's not valid" isn't completely accurate either, otherwise we'd have no car reviews

Preferable? Yes. Completely invalid results if its not blind? No.
Others may come to different conclusions, as with all things. Overall, i like the ultra better since you get more/nicer finish options. But soundwise i couldn't give the edge to either. One man's opinion, yours may differ.