I`ve tried them all in the past and would say the best browser by far is Avant by miles...
Is Avant Browser a secure browser? Yes, Avant Browser is secure. Since it's based on Internet Explorer, Avant Browser is as secure as Internet Explorer
Tested Systems: * AMD K7 800 / 256 Ram / Windows XP Home Edition / Internet Explorer 6 * Pentium-4 2.4G / 512 Ram / Windows XP Professional + Service Pack 1 / Internet Explorer 6 SP1
Will stick with FF 3