Exit bag with N2, because of its reliability, peacefulness, and availability of exhaustive step-by-step instructions in both PPeH and 'Five Last Acts'. The fact there is published research available and it's time-tested makes me feel confident in using it. @TiredHorse's vast knowledge and willingness to answer questions have both been enormously invaluable.
But I am also keeping my eye on SN developments. Because, frankly, I'd rather lay down and die in my bed, but unfortunately that's not recommended with the exit bag as it may come dislodged, interfere with the flow of N2 or exhalations, etc. I've got the Primperan and the SN and acid reducers are both easily obtainable in the U.S.