I live in Seattle, and I've heard that people in the Vancouver area are mostly split between the Blue Jays and Mariners when it comes to baseball. People may point out the Jays coming to Seattle in droves, but that's their only chance to see them each season. M's fans in Vancouver have all season to make a trip to Seattle.
There are definitely more Blue Jays fans in BC. Probably a 75-25 split?
The Blue Jays are my #1 team and the Mariners are my #2 team, although I’d cheer for the Mariners over the Jays if they were in the playoff picture and the Jays were out of it.
I hate that I’m a Blue Jays fan, though. I hate cheering for a Toronto team and I’d much rather be more emotionally invested in the Mariners.
Unfortunately, you can’t really help who you cheer for and I think I’m like a lot of other people in a couple ways :
1. The 1992-93 World Series wins happened when I was a kid, and contributed to creating a lifelong attachment. The Jays (and Expos) were the only team I really had access to growing up so you end up cheering for what you know.
2. The Jays currently do a terrific job of getting their product into the BC market and the Mariners do an absolutely terrible job. It’s really easy to follow the Blue Jays – every single game is on TV in this market, they’re at convenient times, and if you miss a game there is Blue Jays in 30 to get you easily caught up. Conversely, the Mariners have (stupidly) done nothing to win over this market through their history. You can maybe watch 25 games/year on TV and nearly half of those are against the Blue Jays, and you never really know when you'll be able to watch them. They do nothing to market here. They have zero presence. It takes a lot of effort to follow them.
The Jays have also done a great job of marketing this ‘Canada’s team!’ thing that a lot of casual fans have bought into. And the Vancouver Canadians are now a Blue Jays farm team, so there’s a local tie-in to watching future Jays when you go to see a baseball game in Vancouver.