Results of the most popular browsers:
Basic(file size, price, language and iOS version support, etc)
Features(tabs, downloads, history, synchronization, traffic comperssion etc)
Performance(results of different benchmarks like Peacekeeper, Sunspider etc)
Final results
Our winner is Safari, the only one browser with access to faster Nitro JS Engine. Then goes Puffin because of high perfomance results due to cloud computing. Atomic is third.
Here is results table of all browsers tested
And here is medal table of all mobile comparisons
iPhone 5 iOS 6.0.2