Very brief Globe interview with Bary Choi: https://www.theglobeandmail.com/investing/personal-finance/household-finances/article-aeroplan-has-become-arguably-one-of-the-best-airline-loyalty-programs/

"Aeroplan has become arguably one of the best airline loyalty programs in the world. With Aeroplan, you can you use your points on any available Air Canada seat with no blackout dates. In addition, they have 40-plus partners, so you can get nearly anywhere in the world on points. They also just announced free seat selection for Aeroplan Elite Status members and their travel companions. That’s not to say WestJet Rewards is a bad program. It’s obviously beneficial to anyone who flies with them regularly. Instead of points, WestJet Rewards earns you WestJet dollars, so it’s like a cash back program that’s easy to understand. But overall, Aeroplan is a better rewards program and has better credit cards."

Only seems to compare with Westjet, and not much detail at all.