Yes the Jays have the benefit of being Canada's team. 

I don't see too many MLB team merch in the streets. Maybe because I'm not a big baseball fan so I don't pay attention to it. But from the ones I did notice, it was mostly Jays merch. In fact, I think I haven't yet seen someone wear Mariners merch in BC. I guess most people here still have the Canadian identity and would support the Jays over the Mariners even though the Mariners are so close.

Many many Canucks fans though, but I guess that's obvious haha.

gnilma

Yes definitely a lot of Seahawks fans. Are the baseball fans split between the Mariners and Blue Jays or it is mostly all Blue Jays. I know the Jays get crazy crowds out to support them when they play in Seattle. 

grayruby

Stacker_Sports

Stacker Sports- Who is Canada's NFL Team?

Quite a few Seahawks fans here in BC, especially during those 2 years when they won a Superbowl in 2014, then got to the Superbowl but lost to the Patriots in 2015. I still see people wearing Seahawks sweaters, caps, or other merch occasionally on the streets.