The problem in asking is that some MSC's are favorites, while the same MSC's are on others bad list....what works for one doesn't neccessarily work for another. Favorites have been listed on this forum, and quick payers like Qams are liked for that, while other slow payers like Service Slueth are liked but do pay slowly.
That has alot to do with favorites to work for. There are many different reasons to like a company, varity and work in your area, quick pay, self-schedule. The bottom line is find out what works for you by trial and error,and reading the forum, you'll find out.
Live consciously....