There are tons of stuff for GND: http://market.renderosity.com/mod/bcs/index.php?TopID=11219.87798 just not what you maybe looking for. 

Both have some fantastic outfits, Black Lotus is a wonderful outfit but I don't know if it is any  better than Blood Fang or Fawne, it is just that Kielo seems to have more fantasy/sci-fi products that appeal to the masses.  

Just look at: 
Seven Seas vs Jeans & Things
Black Lotus vs Blood Fang
Xil vs Xil (work for both - no loser)

It is all in the direction of the outfits, Kielo/AS leans to the fantasy, while GND/Blackheart leans to mainstream.  Both are excellent products.