Less or more? What's looks better?

[FishyFishy!]

I like it in the first picture as far as rock formation is concerned. But, if you just practice some good husbandry, those SPS should grow out nicely and fill those gaps. I personally would rather some nice big colonies than a bunch of frags. More room for the coral to grow into is always better. You just have to resist that "fill the gap with rock/frag" stages. I know its tuff... but at this stage, just step back and let it grow!