I have been looking at heaters for when I set up my 90 gallon semi aggressive tank. I want one that will be consistent and stable for 79°F. I prefer adjustable heaters and am looking at 300 Watts. Brands I have looked at are Aquatop, Aqueon Pro series, Fluval, and Eheim. Are there any real differences, or does it just come down to "a heater is a heater"?