Brighter / warmer might be difficult for people to respond to without being a bit subjective. However, Axiom posts the frequency graphs for all of thier speakers online so you could bring up both models and see how they perform a bit differently at relevant frequency areas. Just be careful to make mental notes of any differences in the scaling used.
Still though, you could study graphs and specs for hours but nothing beats hearing them both side by side as, unless you're trained to do otherwise, your brain will still likely make a preference based on personal subjectivity. Nothing wrong with that. We like what we like!
With great power comes Awesome irresponsibility.