Hair Changes......Blonde vs. Brunette

I was going through some old pics this morning and I passed some of my pics from my brunette days.  I just got thinking that it is crazy how different someone can look with just a different hair color.  It almost changes your entire identity haha anyways I thought I was just put that out there for a random post of the day.  
Here are some examples of celebs that have hair changes as well.  
Lauren Conrad

Cameron Diaz


I want your opinions.  What do you prefer??