yes... He had " just an axe" nothing special about that axe, you are right.
first off, you writting like that shows you have no knowlege of lore. Since Varian > garrosh not " / " since he almost killed him in wolfheart. there is no infomation why saurfang would win over Varian. Saurfang is a good warrior, not just good he is briliant, one of the best. But Varian is impowered by a God, and garrosh is also a briliant warrior, as good as they come. So i would say varian also would win here, mainly because empowered beats normal.
varian vs broxigar that i can not comment on, Varian have his super dragon onixya slaying swords, Broxigar have his super demon slaying enchated axe. Both are as good as it comes to fighting, i would say a it is about euqale