As others have said .. for short haul or trans-border economy Aventura might be better. However booking an international flight in business or first Aeroplan is better.

Another thing to note that for international flights the terms are
"Europe: From a major gateway in Canada or U.S. to select destinations in Europe"

"Rest of the World: From a major gateway in Canada or U.S. to select destinations in Africa, Asia, Australia, New Zealand, South Pacific, Middle East or South America"

No clue what a MAJOR GATEWAY means or how strictly it is enforced. If your home airport is Thunder Bay, Saskatoon, Victoria or the like you might need to be careful. Also no clue what SELECT destinations are.

Note is that you can not start your trip outside North America with Aventura. I have used Aeroplan's Asia1 to Asia1 business class reward of 30K many times when adding on a few extra days to another trip.

Another note - I don't have the Aventure card. In the last month I called CIBC travel rewards 6 times to inquire about valid routes and how the prices of fares are calculated. I have never been able to speak to anyone. Each time I called I hung up after waiting at least 95minutes. One time I waited 125 minutes before I hung up. All calls were made during normal business hours M-F 9am to 6pm

In the last 3 months I have called the Aeroplan 4 times to inquire, book, change and change again an award ticket. I have never had to wait more than 20 minutes to speak with an agent at Aeroplan.

To each his own .. just my experiences and thoughts.