As a former Air Canada purser who worked with flight attendants from both groups for a number of years, I found that there were excellent crew members from both groups. There were also a few bad apples from both groups. I think it is pointless at this juncture to try to ascertain the company of origin of Air Canada staff.
In addition I find the ageism that rears it's ugly head from time to time on this board less then constructive. As long as a crew member was well groomed and performed their job in a courteous, professional matter, good looks and youth were of little consequence. Often, there was nothing quite like, a mature, experienced crew, who had a good time working their flight and included the customers in the good time!