Cirque Du Soleil- "O" or "KA"?

Okay so I was supposed to have a Sweet 16 for my sixteenth birthday, which is usual. But I decided that instead I wanted to go and see a Cirque Du Soleil show for my sixteenth birthday. Right now it is between "O" and "KA" , and I cannot decide. Anyone who has seen it and not just the trailers, please help me. :( I'm so indecisive.