I think the ketamine is sort of irrelevant, no? whichever one is more painful sober is still going to be more painful on ketamine. I've never done either ofc, but I would kinda assume hanging would be less painful than cutting one's jugular? and also more likely to be successful in general. I'd also imagine it would be harder to cut like that, both due to coordination loss on ketamine and SI in general. If pain is important to you during CTB, as it is to many, maybe you could consider more peaceful methods? I wish you peace.