How is BQB Lineas Aereas?
I have flown them MVD-AEP back in march.
Very well-run ops I must say (I too was faced with the unreliable AR or unknown BQB dilemma).
They do things 'old school' , with manual boarding passes and Pre-printed baggage tags. I did find it quaint to be asked for seat preference and then the agent placed a sticker with my seat number on it (I didn't bother checking if they had web checkin, such a short hop).
There is actually inflight service on a 45mn flt. You get a sandwich and a drink in a real glass.
My only caveat is that the aircraft, Q400, is not parked nearby the terminal (I doubt that the airline has much say on this) so you need to wait for the bus and wait for it to fill up to reach the terminal, when you are literally 300' away!
I would fly BQB again (though my one time experience can't speak for their OTP, surely it can't be worse than AR's)