I may be prohibited from purchasing a firearm, but let's assume I am not. Which of these two methods would you recommend?
If you can figure out how to do it, I'd go with partial suspension hanging. This would be my preferred method, too, if only I could figure it out.
I did get a gun with the intention of shooting myself, but I'm going to try other methods first, because the idea of surviving a gunshot wound terrifies me. (I've always hated guns. I've always been anti-gun, until I needed one for suicide. LOL) Now I go to the shooting range to practice shooting it. (...and I still hate guns.)
I'm going to try the nitrogen method first. If I somehow fail setting that up, then it's the gun for me, ...and I really hate that. But, I did try the tourniquet method and failed at that, which is sort of like partial suspension hanging. I also tried to hang myself from a doorknob like Kate Spade, and failed at that. I'm a failure at life, and I'm a failure at death. One way or another, I'm going to get it right, and hopefully either the nitrogen or gun will do that for me.