Ive had both and theyre both great. The JBJ has 2 float sensors so you can control when the pump will turn on and off. The Tunze will go keep a more accurate water level with its optic sensor. The JBJ has an outlet for a pump or equipment of your choice, whereas the Tunze has its own pump.
Most people will swear by Tunze because of the accuracy. Ive heard JBJ sometimes fail. Only downside with Tunze is that the pump makes a loud sound (maybe as an alarm for you?) and it goes off quite often to keep an accurate water level. Go with Tunze if you can afford it!
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