Both products do exist, in the end it will be the individuals' preference as to which they get.
I have actually been debating buying a neosd myself so I can try it out firsthand and see how it is. The only thing stopping me is having to head over to NG for any type of support. I dont need to deal with the drama, sarcastic, belligerent, disrespectful responses/attitude when I have question about a product, even if the answer to my question has already been answered in 2,000 other posts on there. I signed up on NG and was immediately turned off to the entire site after reading a few threads, thankfully I found this site because of Darksofts blog.
But, for me, the clear choice is Darksoft for the following reasons and possibly more that dont come to mind yet

:
- Ongoing, Accessible, Quality Support for all products - (I cant stress how important this is, I believe as long as these guys are alive they will support their products)
- Easy to approach, talk to - (I have never had a bad experience from chatting with these guys, even on some of the most obvious/dumbest questions/topics I have brought up)
- This site/community - (This site welcomes all and doesnt judge and has an amazingly talented/skilled member base)
- Consistency/Product Quality - (DS never stops working and he has been the sole source of producing multi kits accessible for anyone to purchase - no limited runs, no I can only sell to local buyers, no I only did it for me)
- Price - (I believe the price for his kits have always been more than fair, some might find the prices high, but in the grand scheme of things, his kits give you access to play all game in real hardware - if you dont like the price there is always mame)