'Best' .. in what sense?
Best security-wise? If it's security you're interested in, it's not so much about your browser as it is about you and the actions you take - or don't take. Security starts and ends with you. That said, some do offer more security than others.
Best in the sense of ease of use? That would be your choice to make. If it were my main interest, I would try a few and go with what I was comfortable with.
Best to you might mean the fastest browser, while best to another something different. It all boils down to your wants and needs. Another reason why (as Bob pointed out) ... details are important.
Other than that, you can always take to Google which will offer you loads of articles such as "Browser Wars: Chrome vs. IE9 vs. Firefox". Or "Best browser 2012: which should you be using?" which breaks it down by speed, add-ons, Operating Systems, privacy, etc.
And that's only the tip of the iceberg.
Best of luck..