I love big dogs. I'm not fond of smaller dogs, I need one that can cuddle against and play with. I also prefer a dog that can "work" by serving as a deterrent to people who might not have my best interests at heart and be trained as a therapy dog so I can make hospital visits to patients who could use some furry therapy.
I love big dogs, but since I don't have space in my little apartment, nor do I have time to take it on long walks/runs for exercise, I would get a small dog. They are also easier to take around with you, when you travel, etc.
I love all dogs, but I prefer smaller ones. However, if I see one walking on the side of the road, I don't care what he looks like! I just want him/her to be safe and warm so I'll take him regardless of his/her size.
I have no tolerance for small dogs. For me, it's pointless having a dog unless it's large and able to make people entering the property weary. Plus I think they are more intelligent - they seem to have more human traits and understanding.