Hi,
Both AC and WJ would be good long term career options.
IMHO - who cares about the time to upgrade. In Canada, taxes are quite high, but as is occasionally said on this forum, the government has not figured out how to tax your time off. To me, an airline job is all about finding a balance between quality of life and your paycheck. You see many many folks at AC who choose to move to the right seat of the Airbus 320 or B767 instead of pursuing a quicker upgrade on the E190. Pay is a bit less, but your quality of life would be much much better.
From what I understand, upgrades on the E190 had been happening within a year, but this was due to a quirk of the company expanding their fleet with E175s/190s. Now that the aircraft are on the property, expect upgrade time to start taking much longer. If wearing four trips and being a captain is your thing, then by all means go for it, but you'll be a bottom-feeder, on reserve and at scheduling's whims for a long time.
My philosophy is I'd fly a C172 if they offered me a job 10 minutes from my home and paid me $125k per year :-).
Good luck with your choice.