For mass-produced chain burgers, I'd say Carl's Jr. is probably the best. Which is too bad because I won't eat there due to their CEO being a vile POS.
"Your kids are starving. Carl's Jr. believes no child should go hungry. You are an unfit mother. Your children will be placed in the custody of Carl's Jr. Carl's Jr., f**k you, I'm eating."
- Idiocracy (but not that inaccurate)
On the subject of Edmonton restaurants (and having worked in the industry when I was younger), seriously, screw them. I worked at high-end and mid-range restaurants where product cost was under 10-15% of the sticker price, as restaurant owners would use tips as a way to cut costs and not pay their staff a decent rate (on top of all of the other shady staffing practices restaurants engaged in, like doubling their staff for patio season then sending half of them home without paying wages if demand didn't materialize).
I get that property/rent and overhead increased significantly during the oil boom, but that boom is long gone and rents and overhead should reflect that. Also, with a higher minimum wage, customers should no longer be 'required' to double the GST on a bill on top of paying $200-300 for a family of 4 for food that costs the restaurant under $30 to make.