[rtkwe]

Nitrogen suffocation any day of the week in my opinion. Your brain lives long enough after the guillotine you definitely have time to feel the pain of the cut while your brain can't even register the hypoxic effects from N2 suffocation.

[tantalor]

More at https://en.wikipedia.org/wiki/Inert_gas_asphyxiation

Good demo here: https://youtu.be/kUfF2MTnqAw?si=Fi3590AiHdTBW3r8&t=329