It's not really worth debating which belt is the best/worst. They all have faults.

IBF - Took bribes from promoters in exchange for ratings back in the 90s. I believe it was King or Arum. Also wasn't it them that rated a dead guy? I will give them credit for rarely handing out "interim" belts. Can't remember the last time I saw an IBF interim champ.

WBO - Ranks obscure fighters and lets promoters like Warren & Universum milk belts with weak title defenses.

WBC - Have shown a bias towards their countrymen. Bullshit Diamond and Silver belts...not to mention countless interim belts. The whole Rocchigiani fiasco.

WBA - They let Guillermo Jones hold a belt hostage without fighting for 2 years. They recognize 3 champs in one weight division. Bullshit Super, Regular and guess what Interim "Champions".