Is the arrangements base on how good they are? or just ramdomly listed. There is no doubt that yahoo has a high reputation on managing campaigns he's a veteran and auditing spreadsheet carefully and eliminate cheaters, he deliver with quality. However julerz is also good he's following the foot steps of yahoo I recommend this two managers.
This list is based on community opinion not on any ratings based and it is open for the people to pick the best manager on their opinion,right now yshoo is having much votes on the pool and on the top of the table,the other manager you have mentioned is doing good but relatively new when compared to yahoo so to build the reputation for him will take time.