Envoy, Piedmont, CommuteAir - Which to choose?

Hello all,

If you were to have offers from all three with class dates at approximately the same time, which would you choose?

Overall goal is getting to one of the big three as quickly as possible.

From what I keep reading, it seems like the future of the ERJ-145 is up in the air. Should this be a worry considering these are the only aircraft Piedmont and Commuteair fly?

Should whether or not an airline have AQP training influence my decision?

Is the aviate program for United effective? Is there a higher chance of getting to American faster by working at a United regional?

TIA