Yeah, Bell and Telus both have better coverage in some of the small areas, Rogers coverage is mostly in the more condensed areas.
I live in the lower mainland, I've never had a problem with coverage where I live, so it's not something that matters to me. And a Rogers phone will work in most countries based on that carriers coverage that they have an agreement with.
Only time I don't have coverage is going through the canyons between Burnaby and Prince George