Pay and work rules are substantially better at DL/UA/AA/WN than Westjet, even with their new AIP.
Worst case buy a ticket YYC to SLC/SEA/MSP and you are still money ahead.
Westjet is a nice airline, but be prepared to do loooong duty days.
There’s some former Westjet pilots at DL. Maybe they can chime in. Canadians don’t have FAR117. It makes a difference.