Well, I've used most the browser that you mention in your thread, but I think that Google Chrome is No.1.
According to users, Mozilla Firefox is the best browser in the world and maybe because is much older then Google Chrome. But, there are a lot of differences between the browsers and here is why I choose Google Chrome above all:
Mozilla - Has a smooth scroll on the page, the layout is better then Chrome, when you download the files they go automatically in the right corner button.
Google Chrome - Has automatically updates, when you go on youtube you don't have to install the flash player, because the browser already has all the plug ins, you can choose a background for you browser...