Huge fan of the Big Red Machine in the 70's age 8-12 or so.... still have some memorabilia. reds were often featured on ABC's Saturday Afternoon Baseball, about the only baseball we got on the telly at the time. This Week in Baseball was on just before that. At the time i could name every player on every team if asked.
After the Jays debut in 1977, much more baseball was available on the telly. Jays were on both CBC and CTV depending on the day of the week. Expos were on french language CBC and when Jays were on west coast, were on the english language channels also. Generally, games were shown on Saturdays, Sundays, and Wednesdays, and the odd other days. ABC still had Saturday Afternoon Baseball, but with the Reds in decline, it became rare that a Reds game was on, and the team of my youth passed. So for 6 or 7 years it was paradise, often both the Jays and Expos on at the same time, was very adept at turning the knob on the tv with my foot while lying in front of it.
I slightly favoured the Expos over the Jays from 1977 to 1983, the heyday of Carter, Dawson, Rogers, Valentine, Cromartie, Raines, Wallach... damn that was a team. Shame they never won.
1983 the Jays had a breakthrough year and became a Jays fan for good.