You need to take a step back and relax, go to the airline that you feel you could be there for a while, it seems like you are so torn between regionals. You don't want to be thinking about it so hard that once you attend class you are still thinking about "I should have gone there". All regionals have their issues and unlike the mainlines who know for the most part what bases they will have as well as number of airframes, at the regional even if the airline has a contract it could be adjusted for various reasons.