which better ARM Cortex-A9 MPCore or Krait with GPU solution

I hope this will speed things up for you: currently, the HTC One X and One S are the two most powerful Android phones available. Specifically, the One S with Snapdragon S4 kills any competition out there (except for the One X). In fact, if you read reviews for the One S, the battery performance is really good. Simply put, if you want powerful phones, stay away from Sony since they always use outdated hardware.