To answer the question, full suspension hanging is psychologically more difficult due to extent of the body envelope violation, less forgiving when it comes to error (higher chance of brain damage and other sequelae), can be very painful/take a long time to pass out if you are unlucky or don't set it up correctly, and I have nowhere to do it.
Partial suspension is notoriously difficult to get right due to anatomical differences, angles, and body position required to suppress the carotids, with a high chance of sequelae if you botch the attempt or are rescued, and I have nowhere to practice it.
I need something reliable, not very painful, easy to conceal, accessible, relatively low effort/not very technical, that kills in a reasonable timeframe, and which can be done at a hotel. SN fits the bill and nothing else really does.
As for air hunger, I don't know why it would cause that, seeing as how you can still breathe perfectly normallyāyour blood just isn't being oxygenated. The tachycardia may make you breathe faster, but that's not necessarily "air hunger."
It causes air hunger due to the metabolic acidosis, but it shouldn't be akin to hypercapnic air hunger, and benzos help a lot with the psychological side of things. To oversimplify, body thinks CO2 levels are high because the lactic acid buildup makes the blood more acidic, and this leads to hyperventilation to expel air from the lungs more quickly.