For a fair price I heard a lot of good about ebo jager heaters. Im sure if your willing to spend a lot there is better but for the price thats probably a good choice.
Stay away from marineland, lots of recalls. Not even sure if they still sell heaters.
ya I will second the ebos for glass heaters, and stay aaway from the stealths. As far as titanium goes, think its a case of the same equipment being rebadged for each company. I have no expereince with titanium heaters either.
I run two of them. No heater gets better reviews. The mullet screams reliability! They are the industry standard. Unless you got cash for titanium heaters