Firefox is the most versatile but you shouldn't dismiss Chrome or Opera.  As said, try them all out over a period of a few days.  You will find yourself using one more than the others.
When I had Chrome I was always going back to FF because it struggled with many websites I visited, plus I am not a fan of it's UI.  I used Opera almost solidly for a few months, but again found I went back to Firefox for one reason or another every day.  Eventually I just stopped using Opera!  That's my own experience concerning the way I like to work and surf the web.  Others will have different experiences.