I don't care what "type" of restaurant it is - what I care about is great service and better food.
I find that the "chain" style retaurants are less likely to measure up to my levels of expectation - and I'm a former waitress, so I expect to receive the type of service that I would have provided!
However, as far as "comfort" goes, I'd rather go to a place that I can wear my jeans in than a place that requires fancy dress. I'm not a pretentious person, and I won't patronize any business that discriminates against motorcyclists - if I ride up to your restaurant in my leathers, and you won't seat me, then believe me, word will get around, and your business will suffer as a result.
(I'm so mean.