^I don't think "better" is a meaningful assessment there. Shatner and Pine are playing two rather different versions of James Kirk. Even aside from the differences in character history, they're played by actors with different styles as preferred by different generations. Shatner's Kirk was the classically trained Shakespearean-actor version, while Pine's is more in the modern, less theatrical style of acting. So it's kind of an apples-and-oranges thing.
....But I still like Pine's Kirk better.(I prefer apple Pine to orange Shatner; or orange Pine to apple Shatner, if you will).