Working at ATP I have come across pilot from many different regional careers. Everyone has there own complaints about the company they work for, but all have said that at least they don't work for Mesa. The few Pinnacle guys that I have met, said that it was okay, but not the best. I have had a handfull of Mesa pilots come in to take their ATP written, and all have said that they call Mesa, Making Employees Suffer Alot, and said that if they could do it again, that they would go elsewhere. I met one of Mesa's chief pilots and he was one of the biggest idiots I had ever met. So just from meeting all of these people, I would say go Pinnacle.