Rogue! As much as I hate flying them, there's nothing more frustrating than having to gate check a bag because the Q400 lacks overhead bin space. At least with the A319 you know you'll be able to put your bag in the overhead bin and put your personal item under the seat in front of you. Sure, the Q400 may offer slightly more legroom than an AC A319 that went Rogue, but given the short length of the flight, you'll hardly notice. The 319 is also a smoother plane since it can readily adjust altitude to get away from the choppy winds. Another key consideration is that AC tends to offer more service in the East than WS. If things go sideways, AC has the route network to allow you to recover from the IRROPS. WS may not as much. Last and certainly not least, if you're looking to earn status, AC offers miles to earn status on their MilagePlus programme (operated by United Airlines
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-James