Different browsers do different things and most are different in the way that they work on induvial items so what works like a treat for One Thing may be totally useless for another.
All Browsers lack in the security department though some are much better than others and you may require things that no browser offers by default like encryption on all outgoing packets of data.
Questions like this are the same as Which is the Best car for some that may be a F1 Ferrari some others may only need to put 1 loaf of bread on the back seat as that is the only storage space in a Porsche 911 or another may just require a T Model Ford for what they want.
But regardless the newest Browser available tends to have the best coding behind it till another company release their new version the next day.