This is a tough call for me.
I like McDonald's all around because of the breakfast (McGriddles!), coffee (Iced Hazlenut!) and Chicken Nuggets. I also enjoy me some Taco Bell even though I have to completely clear my schedule when I eat it because it makes me feel like shit.
But at the end of the day, I have to give it to Wendy's. They, imo, have the best tasting burgers, fries and chicken sandwiches. While they lack breakfast, their lunch food is the best.
Sorry if I didn't include your favorite in the poll, just select "other". I only included chains with a drive thru.