Oh no no, man. Timmy's is not your friend. I'll get a box of Timbits and tall coffee with cream whenever I'm in Canada but that's more like it helps me feel like I'm assimilating than anything else. It's okay as donuts go, nothing more. But in the US, Tim Horton's is not as good. I might even go as far as say it's not good. Especially when there are so many options that are not Timmy's.
When I lived in Michigan my partner and I would occasionally visit Zingerman's Bakehouse on Saturday morning and share a couple donuts with coffee. The apple-bacon cake donuts were some of the best things in the world. I miss them.
There's only one Krispy Kreme within striking distance from home here. Fresh off the conveyor is about the only way I can stand their donuts but wow, when they're so hot off the conveyor the clerk is bagging the donut using a stick rather than his fingers I can practically inhale 'em. They taste totally different, and not as good, as little as a half hour later.
My failsafe favorite is chocolate cake donut, iced. Chocolate glazed, by Dunkin Donut parlance. My favorite breakfast for years was a choco glaze, Boston creme filled, and large regular coffee. I'm older now so that has to be cut back to a choco glazed and regular. Dunkin Donuts coffee is the only coffee I can stand to drink with sugar in it.
Probably a good thing that donuts are a once a month or less thing for me.