I don’t have an enclosed so cannot really say whats better. They both require power, im not too sure what fuel consumption is comparing the two, but theoretically the diesel unit should be more efficient, as theres more btu/volume of fuel, compared to propane. The couple times I went with guys who had propane heat, they seemed to be fairly conservative with running the heater so they didn’t run out, so not sure how long a tank lasts?? I would like to letter buck all day and come back to a warm trailer if the cost was reasonable. Really really, its a 250 dollar gamble to try the diesel unit, if u like it, sell the propane furnace. If you dont like it, well shoot, Im sure u have pissed Away 250 on dumber things......