My guess is that constant use would be more economical - mine had a tendency to evaporate if not used (even when I remembered the rubber covers
).......so it seemed like I was topping it up far more than was neccessary for the use I was getting from it - because I was!
For very occassional use Gas / Propane
probably better for that reason. But not enough for me to "upgrade" and I have a spare one sitting at home, so mainly just a time / aggro thing. Albeit if my boat came with a Gas / Propane
Cooker installed I wouldn't change it out - I also use gas for light
..........and that with a Camping gas lantern that is over 30 years old
and I smoke