No question, if I was your size, I would go with the 29er. I wish they had a 650b 27.5"er to test ride. I have to say, the 29er felt more like a comfy touring mountain bike to me, where as the 26er felt like a sport mountain bike. I only got to go over come deep potholes and 6-8" curbs, but I felt more secure going over these at a slower speed with the 29er. The 6500 also handled these well. It's just that I didn't feel as confident. I will also say that the rear of the 29er almost felt like it was slightly suspended compared to the 26er. The larger rear wheel and tire gave it more of a cushion, but did give up some feel. My LBS also said the 26ers wheels would be stronger than any 29ers. Thanks guys.