IMO, I like the Biocube, because its integrated wet/dry filter is three different chambers, whereas the aquapod only had two (I think)? Also, I liked the fact that the lid was not permanently attached which allowed for modifications and the ability to add on filtration equipment. I also liked the fact that the BIOCube left more room above the integrated filter (Tip: a 9 watt Coralife UV Sterilizer fits on top of the integrated filter without any modifications to the lid!) I've heard that the glass on the BioCube was thicker, may or may not be true.
Although the RSM is clearly the best, its also clearly the most expensive @$600+ I'd rather buy the BC29 and choose my own skimmer. Also, with the BC29 w/HOB skimmer, you still have a refugium. I'd prefer an in tank refugium vs. HOB because I think a refugium should get greater flow than HOB can provide. Plus, the RSM lighting is good, but since its hood is attached, its harder to upgrade to better lighting. I would pick a BC29, $150 *rare gem stone* skimmer (people may or may not get my code speak, just PM if ??), $200 pendant/clamp on Viper MH lighting for a total of $600. A RSM costs $750.....
Anyway, I ended up buying the BC29 gal. based on the aforementioned logic. But, if you don't plan on upgrading filter/lighting on the tank, RSM is the best, most expensive, stock tank.