I have both Tunze and Vortech powerheads on my tank. I like the look of the vortech, but the reliability of the Tunze design is much better. I have had vortech wet sides break and have had to replace the dry side bearing every 3-4 years. Tunze has 1 moving part and is easier to clean. The feed button on the Tunze is much better as you only need to push it unlike the Vortech which you have to hold for 3 seconds. Tunze are also cheaper, but are a bit louder when operating.