"Tim Hortons"? Yes, I agree with the tasty donuts. they are totally awesome, specially my favorite is boston creme donuts with medium black coffee. However, I can not say that Tim Hortons has the best coffee in Canada. I rather go with "2nd Cup" which is "Starbucks" of Canada with much much better coffees.
for me, Injerto coffee shop in Guatemala city. Pacamara / Chemex preparation was and still is the best for me.
FYI, Injerto farm in La Libertad, Guatemala is the most famous coffee farm in entire Guatemala and they specialize in Pacamara. Also, they have won virtually every top awards in CoE Guatemala since 15 years ago. Due to their fame and reputation, entire farm coffee productions (I believe that they produce 30 containers or more a year? Not 100% sure, I will have to check on this...) are being sold in international auction.