The mistake I made was to apply to them all together ... QR called me for interview literally the next day after filling in the online application. The job I actually wanted, EK, called me back 4 months later by which time I'd run out of stalling tactics, and I'd already signed the bond with QR. Act in haste, repent at leisure as they say.
They are all three desperate for pilots at the moment, so as long as you meet the minimums and you aren't a muppet, the ball is in your court. Apply to the one you like most and then wait 3 months before you apply to the others.