For newhires, the correct way to bid aircraft when asked what aircraft you want is "I would like the ERJ, but will take the CRJ".

Why? If you say ERJ only, you will not fly. If you say CRJ only, you get seat locked for a year and a half. ERJ will take CRJ, seat lock only a year

This was from the lovely ladies at HR in St. George so take it for what its worth.