I prefer the Gold Cube any day.  I have used both and IMO there is no comparison.  Not to mention the versatility of the gold cube, where the blue bowl is a one trick wonder.

There is no comparison between the two and as far as I am concerned they were designed for separate purposes.  I owned a Blue Bowl until someone stole it out of the back of my pickup (Thank goodness).  I also own a 4 stacker Gold Cube.  The Blue Bowl is used to separate the gold from the black sand small blond sand once it is refined to that point, like after you run it on through the Gold Cube and screen it down.  I use the Gold Cube to get my material down to the point that I could run it through the Blue Bowl if I still had it.  I live in Colorado and the gold there is mostly fine and too small for the Blue Bowl.  I was told by the manufacturer of the Blue Bowl that is does not get fine gold very well, and from my experience, it doesn't. There are several other superior methods of recovering fine gold.  It does work good for larger gold flakes.  What I use now is the Catch-It-Two water table.  I take my material and run it through the Gold Cube first and then screen it down and spoon it on the Catch-It-Two water table.  The Catch-It-Two water table is slow but you can recover gold so fine that you need a magnifying glass to see it.