Most of the time, you can't be purely judging a camera by its brand. People may have preferred interfaces and features which only certain brands possess.
At the same time, if you have a camera from a "more popular" brand, it might be better for long term dedication.
If you're seeking to purchase a camera, it would always be the best idea to feel the camera, try one out, and see which has the best 'touch' to your skin, and which ones you like more.
But of course with different brands of lenses only working with their own brand of DSLRs (certain lens manufacturers produce lenses which are compatible with other brands, with possible limitations), you should stick to a brand of DSLRs as long as required so you can use your lenses with different cameras of the same brand.
I hope I have not been teaching the wrong thing.