This is interesting. I think I'd love to hear both. Success stories give inspiration while failure stories – hope, and that thought that you can always do more, do better. :)
I feel its important to have both. Take the journey as it is.
An overload with success stories creates unrealistic images and expectations, while focusing on failures can kill the spirit.
Success stories are good for motivation but as we progress, we need more of "struggle stories", i.e., the hurdles and failures they went through before succeeding. In my own business life, I've had many good and bad experiences that taught me a lot. So, sharing those experiences with others would make their journey easier. About failure stories, I think I can create many of my own.