First let it be "known" I am not against sand beds per se...In fact i have one (SSB) in my 210 Aggressive
Mostly for the type of fish that need a more "open" rock work and large sand bed surface to be comfortable...
And with proper flow, filtration and nutrient export it is clean, stable and algae free...
However it is not what would be classified as a "living" sand bed...again due to my fish "choice" I can only keep a limited clean up crew (they keep getting eaten
) and minimal "bugs"
It's only because of the "success" I've had with "non-living" sand that I chose NO sand in my reef...Again "MY" vision of a reef is to mimic a "small part" of the reef rather than "the whole ocean"...in this case "the upper left hand corner of the rock wall...right about ...there"
And yes that does limit somewhat the choice of critters I can put in there...No sand sifting Gobies in my BB
The biggest factor "for me" is I don't mind the "mechanics or look" of it and "choose" not to get excited over "bugs and worms"...
For "others" it may be all about the "mini ecosystem" they have created and are maintaining OR some combination of the above...
It really depends on what the Aquariest is comfortable with as there are many different ways to maintain a "successful" tank...
I think the question of "Which is Better" is a moot point as we have seen all three...DSB, SSB, and BB have proponents, success stories (and pictures) horror stories and detractors...
So really folks...The statement "Your Tank...Your Choice" truly applies here...
Just depends on what YOU are comfortable with...