Like David mentions it's not really about which is the best browser, but picking a browse that isn't chrome as favour to the open web. As a side effects you'll discover a lot of bugs that were likely to otherwise be missed in both your products and others'.
The Chrome monoculture among developers can easily cause a negative spiral were websites aren't tested in other browsers causing users of those browsers to be discontent with the browser and switch away from it likely to Chrome which will work. It's this exact behaviour that contributed to the IE6 situation.