Here is my two cents on the Aquariums. I personally chooce the JBJ 28 gallon JBJ Nano Cube
HQI because of the lighting preference and the ability to upgrade to bigger and better things with this setup. Just like most Nano Aquarium limitations exist and things eventually do go wrong. I will say this much I personally favor the 28 gallon JBJ Nano Cube
HQI over the Oceanic BioCube 29 gallon. But what are you trying to achieve in this Aquarium? Do you want SPS Corals or Soft Corals? Maybe no corals at all?