Again. NO! They are different not better. You just suffer from the same affliction alot of players seem to have; the ooooo shiny syndrome.
I call this condition novaphilia
which basically translates into LOVE NEW STUFF. Those most at risk of this debilitating illness are simple minded children and low IQ adults who look at pretty statlines and rules without the rationality to think things all the way through.
I once feared that my younger brother was so afflicted, but no, he did not start tyranids to my relief. Now he has an army of space wolves that he doesn`t want, and a growing force of blood angels which are no doubt headed for the same fate.
Me? Noo... TYRANIDS FIRST AND ALWAYS!
I`ll start BA or wolves when I damn well want to, not when a shiny new dex comes out...
Back to tau.
Coder 59 is right, Fire Warrior was a pretty shit game.