Starbucks has far too many coffees to say "I don't like Starbucks coffee". Generally they roast darker but try these:
Breakfast blend - light bodied, slightly nutty
Guatemala Antigua - very smooth like cocoa
House blend - decent, sort of generic but yummy
Pike place - medium roast, medium body, but has a little bite. More interesting than House
Columbia Narino Supremo - nutty, smooth, very good
I was "Coffee Master" when I worked for Fivebucks at one point. It was fun I guess.
Tim Horton's coffee is so popular and it is in fact a Columbian bean, and I heard once they add hickory flavor. Tim Horton's coffee does not taste correct like coffee should and is pretty shit coffee IMO, the reason people love it is cause they sugar and cream the fuck outta it with double double or triple triple, which makes any coffee just taste like a coffee milkshake