You must not have any other contactors but AB from your wholesaler. Hell they all do a good job if you do a proper pm on your equipment.
We've used all type except the el cheapo's. We have used AB before but one seems to last as long as another.
Remember that a refrigeration mechanic can do both refrigeration and heating and air but a hvac mechanic can't do refrigeration work. (a old local saying but it seem to be true at least in this area.) We have local lg AC Contractors that try to do these store refrigeration and when you get at the job all you can say is why me.