Jet I've had both and to use on a boat I myself would use the Coleman jigger , if the wind could blow the flame out , I really don't think you would be fishing ,more like hanging on for grim death
I've never noticed any fumes with mine ,it's a very nice flame , I also have the Coleman dual fuel stove that is the same ,no fumes ,and both have been used in enclosed spaces
I will admit though I haven't used unleaded fuel in either as I got a 20litre drum of shellite with my stove but I reckon they are fairly efficient at burning fuel
Again if I were to use either in my boat ,same as you with my kids on board ,I would use the Coleman hands down .intial costs are bit more , but as you have stated you have the fuel onboard ,win/win i think
I do like the billy idea ,serve two purposes, nice