I'd say no discernable difference between the two for this very short 48 minute flight. I'd choose the one that suits you based on convenience and fare (we discovered that Alaska/Horizon may be a bit cheaper on PDX-YVR if that helps).
If you want to earn frequent flyer miles and elite points, then AC is in Star Alliance. AS is independent but partners with a lot of SkyTeam and OneWorld airlines to earn miles and in some cases elite qualifying points.
For today, AS has six daily services and AC has four.Edited: 9:41 pm, February 18, 2013
There is no discernible difference, or hasn't been in my experience.
The flights arrive at a set of gates a little away from the main terminal building. You'll walk down the steps from the plane to the apron, pick up hand baggage if it's gone in the hold, then set off down a long corridor towards passport control.
AC used to offer a drink of water or orange juice on the flight; AS offer still water for the short trip along the coast.
Amtrak has quite good train service for that very short run - the Cascades service
(Horizon has free beer and wine on most flights, but that route is so short, I doubt that they'd have time)
I flew PDX-YVR recently - a good flight on HorizonEdited: 10:27 pm, February 18, 2013
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