I am debating btwn the Droid Bionic and Iphone 4s. The most important thing is battery life to me. Which one is better. The 4g is a non-issue to me and i will probably keep the phone on 3g anyway to save battery life. I am a heavy usser and just need phone that can go on the internet ok. Which one has a better battery life the bionic on 3g or iphone 4s?