I use the EccoTemp LPG L5, I can’t speak about the other one, I can say that I am very happy with my EccoTemp LPG L5. The only thing I didn’t like about it is the hand held shower nozzle, it leaks at the connector, and the on-off switch is very difficult to use, if your hands are wet or soapy, forget it, it’s nearly impossible to function.
The temperature of the water that comes out is very defendant on the temp of the water going in, so in the summer, we turn the heat down and in the winter, we turn it up. I also set the temp to be the hottest I would like it all by itself, I don’t try to turn on the hot and the cold water to blend them, if you do that, while you are adjusting the water temps, you are wasting water and gas, so set it to the temp you want when using only the hot water.
After reading about the other water heater, I would say this looks like it may be a better water heater, it requires no batteries or electric hookup, and it doesn’t need to be vented, it does cost more though, I would say that if you can afford it, get this one, if money is very tight, then get the one I have, it works and it works good.