Montreal was easily the most popular team in the area. They were also easily the most hated team amongst fans of other teams. Nobody here was on the fence about Montreal.
Toronto certainly had a lot of fans here too, but they were a distant second. There just wasn't as much passion about them. During the 70s and 80s, if both those teams had played in playoff games the night before, the Montreal game would be the one most people talked about the next day.
I can also say that while fans here cheered for both the Expos and Blue Jays, the Expos were the team they cared about the most.