I've pondered this for... years now, honestly.
It's almost always been between heart and mind. Time was in the running for a bit due to my love of instruments, but a hobby doesn't determine my aspect. Besides, music does wonders for self-expression. Only issue is that whatever I may be almost seems to flip flop at times. Sometimes I'm absolutely a mind player, others I'm heart all the way. I suppose caring so much about it could point to heart, but at the same time understanding the self could lead to understanding others, and the world.
As for my class? They aren't pretty, either a page/bard of heart, or a mage(?) of mind.
Again though, this all is wildly inconsistent and I could wake up someday and go "wow I've been a blood player this whole time how did I never realize."