If I would be doing it correctly, then hanging. The jump is only 12 stories, so hanging has a higher chance. Do what best fits your circumstances. Do you have time alone? If not, jump. Are you more worried about success rate? Then hang, and so forth. I am not using hanging, so I am not entirely sure of the differences between using belt and others, but I presume it'd be the same mechanic. Some people have trouble with finding the artery, other's can't get the mind to jump, and so forth. In other words, make sure you can actually do the method before deciding. Good luck.