They originated here, so people support them. (They're headquartered in Burlington and owned by the people who own Second Cup or Coffetime, which ever is the one that has the pest problems in their stores.)
All of Robin's coffee is organic (or so they say) and they're more common in the inner city, and they have Pizza Pretzels and Persians (and a few have 241 Pizza outlets, its owned by the same company). Tim Horton's is only found outside of the downtowns.
Another Tim's opened in the north east end, and a Robin's opened in the southwest end, so they're tied 16-16 right now. (15-16 Tims if you want to get technical; one of the Robin's is located in the government building on Fort William First Nation.) There are also about 25 non-chain coffee houses, but only about 10 of them are in the same league as Tim's and Robin's. The rest are real coffee houses.
I remember when we went to Sault Ste. Marie in 1999 we went to a Tim Hortons for the first time (we've had them since the 1970s but they didn't open more locations until about 2000) and my uncle asked for "Robin's Eggs", and the woman said "Pff. Go three blocks
west ". Lots of people still call them Robin's Eggs, but Timbits is most common among young people now.
Many Robin's Donuts locations have also been renovated and are really quite nice inside, Tim Horton's is more generic and sterile. All of the Robin's Donut's locations are different, while Tim's uses only 2 or 3 plans for almost all of their stores. In many Robin's locations, even the furniture is unique. The one in Current River (far northeast) has a fireplace and seating area with leather couches, it's a nice space.