Interesting question. Which type of wins should be considered a bigger achievement.
There are wins over certain fighters who have shown tremendous h2h abilities and talent, but their overall resume was lacking.
Then there are wins over proven champions with great records who's h2h abilities/talents are not quite as good.
Examples to clarify.
Thomaz Adamek have a much better resume than David Haye. David Haye was considered the far more dangerous opponent.
So which win is better? Vitali over Adamek or Wlad over Haye.
Lennox Lewis knocked out Andrew Golota. Golota was not a champion and didn't achieve much. But AT THE TIME he was a heavy betting favorite and just came off of back to back domination performances against Bowe.
Golota was a far more dangerous opponent than say Tony Tucker.
Yet when Lennox beat Tony Tucker, Tony Tucker was already a multiple belt winner and came into the fight with a shockingly good record of 48-1.
So which type of win is greater?