Aesthetically, I personally prefer FF. But the real question, the thing I don't understand, is why Chrome is better than FF. FF used to be better than IE, true. Now there's more competition, true. But that doesn't mean that FF can't be improved to be even better than Chrome. I just don't see why FF has to be behind like this.
@Daniel, the problem for Firefox, is that there are more than two competitors now, there used to have just been ie and Firefox, Firefox is better, ergo, firefox wins. Now that there are more browsers , specifically ons which plan to be asthetically pleasing and fast, such as chrome, people don't care about Firefox anymore.