I love my reefdose 2. The only others I have used were kamoer. The kamoers worked fine and are much cheaper plus you can buy an individual head.
The ones I had used smaller tubing than the reef dose which can clog easier. The app is OK but I really love the redsea app.
If I needed a single head or if money was a factor I wouid have no problem with a kamoer.
Money not a huge concern and I need 2 or 4 heads I'm going reefdose.
A lot of folks use jebao and are happy but I've not used one.