I think that full suspension is the way to go if considering hanging. To me partial appears as too easy to back out from/not commit fully.
As for pros and cons: in hanging you know what kind of pain and discomfort to expect, the process is straightforward in terms of mode of action. With SN we don't know whether people who ingest it do indeed lose consciousness or just become unresponsive and are in pain once it takes effect. Hanging is a more known of the two evils. One benefit of SN would perhaps be that it leaves a less gruesome scene for anyone discovering the body.
I am still somewhat on the fence between these two methods (full suspension and SN), but as my desire to CTB increases the SN stashed in my room looks increasingly appealing.