Q: Which one is better: Tim Horton’s or Starbucks?
A: Starbucks naturally. 
If you are asking about contamination and a cafe, the answer is nearly the same. Tim Horton’s website declares none of their beverages or products to be gluten free. Starbucks does not BAKE their own stuff there. They essentially make beverages and stock the baking.
Tim Hortons is a bakery. They bake with flour. And it doesn’t take much to realize that flour get in the air, ducts, fans, etc and can end up anywhere or everywhere. Nothing is guaranteed gluten free. However, depending on your comfort level with the risk of contamination, I’m sure a fresh pot of coffee, in a disposable cup wouldn’t likely be contaminated. Now, if you put sugar in your coffee, all bets are off. They use a common sugar container when fixing beverages.
So, like I said, Starbucks kicks butt! 
Oh, and Happy Halloween!
