This seems random, but I had mentioned in
this post that I was going to do a comparison between these two. It was over a year ago, but time flies by.
I like both, but the OPI has a special pink microshimmer that makes it special. The NailNation is a bit sheer, but the holographic effect is very strong. Color wise, I think the pics are very accurate, they are very similar, and it's hard to tell them apart in the shade.