Which sn combo is better?

[FrankieMay]

Thanks in advance for the advice. I currently have 2 options and definitely want to do a combo to ctb just to be sure. Which do you think is most reliable:

1. Sn + carbon monoxide
2. Sn + drowning (take the sn in a hotel bathtub or maybe lake)
3. Something else?

Thanks

 

[Diewell]

What's the worst thing if just using SN and failed? Why is there a need for additional combo?

 

[FrankieMay]

What's the worst thing if just using SN and failed? Why is there a need for additional combo?

More foolproof I suppose

 

[Ivenocare]

maybe a form of hanging.