I'm not an expert or anything, but I think jumping has a greater chance of success compared to SN (if done from the correct height). However, I still think SN is a better method because if you fail at SN, you probably won't have lasting side effects, whereas if you fail at jumping, you will be extremely screwed. Before I learned about SN and N, I had been planning to jump, but luckily I realized that I shouldn't since there wasn't a clear path to the ground. It's a shame because if the path were clear, it would have certainly worked (the building was 37 stories high).