Neither guy has played particularly well. JT had better feet and generally made better decisions last year. Cardale is a bigger man with a bigger arm. His under throws let a defender catch up, but they also lead to PI calls. Also he forces a defense to defend more depth of the field, although JT is probably better at forcing the defense to defend the width.
In the end, I want the guy who makes more plays, wherever they are, and doesn't turn the ball over. I will cheer whichever QB that is.