Pick the one with the best group of pilots....being in a squadron is much more than just driving a grey jet...
You could be in the worlds greatest airplane but if you are stuck in a squadron with a bunch of idiots life is going to suck.
Other things to consider, what moral like, what's the commuter policy, are all drill weekends mandatory, deployment rate & length of time. As a part timer how hard is it to keep your monthly currency/beans