As the Origo stove is no longer available, I got out my Trangia burners and reran the results that I first posted here
https://www.swallowyachtsassociation.org/smf/index.php/topic,1305.msg10274.html#msg10274. In all cases, second time around was slower than the first time, possibly because I was using a pan instead of a kettle to boil the water.
Time in minutes to boil
2017 2020
Trangia gas burner, Coleman gas cartridge 3.0 3.1
Trangia X2 multifuel, Aspen 4,
Omnidawg silent cap, 37mm jet* 3.1 4.2
Trangia X2 multifuel, Coleman gas cartridge,
Omnidawg silent cap, 37mm jet 3.5 3.6
Trangia spirit burner bioethanol,
winter attachment 5.9 6.2
Trangia spirit burner bioethanol 7.9 8.7
* Does not include the significant time needed to prime or to turn off and burn excess fuel. Used a 32mm jet second time around
Conclusions? Leaking gas concerns apart, the Trangia gas burner is the safest, most convenient, hottest and most adjustable heat source. I'll be relying on that on future cruises and will get a second gas burner for when I'm aiming for grande cuisine. The cheap and cheerful Trangia spirit burners (bioethanol) will be kept in reserve. The Trangia X2 multifuel burner gives lots of flexibility when you run out of fuel and you can't get gas cartridges or bioethanol. However, its lengthy priming process with pressurised liquid fuels is quite scary, especially on a small boat, and the system will be going on eBay shortly.