Cant comment on which one, but you can always only light one burner and have the other in reserve. Its a blue flame one nowadays I presume, a yellow flame is out.
I used to get fed up with trimming the wicks and buying new wicks.
Its electric every time for me now, with a froststat setting so it comes on if its frosty, you can also set it higher as the switch is a thermostat which I guess you know.
You often see fan heaters being given away on Freecycle and most have a thermostat control nowadays.
Hope that helps :)