Well, maybe each member has their own view regarding top bounty managers in this forum. But I can say that those bounty managers who handle some campaigns on the "services" section, has a better reputation than others. You can take a look at their ANN services or contact them directly. Here is the list of some top bounty managers in my opinion:
1. Hhampuz
2. yahoo62278
3. Coolcryptovator
4. roycilik