It all depends on where you live in Phoenix. Driving across Phoenix to get to one airport or the other can COST HUGE amount of time and money.
Chandler airservice is great. SOme of thier instructors are a pain in the a$$ and think because they have 10 hours flying aerobatics that they know everything. The Owner is a Jerk flat out. But still a great school.
I would also suggest Pan Am and ATP. ATP would be my first choice. This is just my 6 years of experience flying in the phoenix area. If you give me your location I can get more specfic. PM me.