I think the machines I've seen on the campus for Carleton are Scotiabank (I've taken a couple classes there, as many of the Master's programs are sorta integrated. But I am not an expert on the campus).
That being said - you can keep accounts with multiple banks if that's what works for you. Particularly the credit card. There can be advantages to having the stuff together (e.g. perhaps transferring from the line of credit to your account is instant if they are the same bank vs. taking up to 3 days if they're different), but if the terms on the different products are better at one bank or the other, you can deal with them both.
I wouldn't necessarily switch to Scotiabank just because that's what's on campus - I'd look at what they offer students. But I would really want to know where the nearest Royal Bank is. Because even if, say, Royal Bank offers a lower fee account than Scotia, that probably doesn't matter if you end up always taking cash out from the Scotiabank machines.
