Personally I'm torn.. I love the idea of palettes. Everything in one concrete area! Eg. Daytime..Nighttime. But what I hate is that I never use them...unless I'm going on vacation or to a shoot.
I find myself using more single shadows because its easier to pin point what I want. Eg. MAC swiss chocolate & NYX red bean pie is an amazing combo, so I lug those around with me in my makeup bag.
So my question for you is palettes or single shadows?