Please read these movies and there description and pick which one I should go see today?

crazies was a disappointment for me. mind you it was a ok movie. but i felt it was more of a rent then a watch. shutter island was a better movie then crazies. it was interesting but not as thought provoking as i hoped it to be. but definitely interesting. lastly cop out haven't watch it but would like it. seems funny and a lot of buzz about it. but since i have not watched it i can not write a review about it. so on my understanding i would suggest shutter island