If you're interested in more comparison between fine liners I've earlier have made a huge comparison and swatch post including 25 bottles in this link; Large fine liner/striper nail art polish swatch guide
I really recommend you to check it out if you're in the mood of getting your self some fine liners. :)
Jordana Pop Art -Black Mark
6 ML
Mixing ball - yes
L.A. Colors Art Deco - Black
7,5 ML
Mixing ball - no
As you can see from the picture comparing the brushes, L.A. Colors Art Deco might have a slightly thinner brush, at least it's equal thin all the way while Jordana Pop Art seems brush seems to be thicker on the non painting end of them. However I believe that the difference is not enough to make a larger difference. I'd also like to note that my Jordana Pop Art is much newer than the L.A. Colors Art Deco and the formula is a bit thinner. I always find fine liners to be too thin when they're newly bought, making the color less opaque. Often I let them open with the cap to make the formula slightly thicker, ie perfect. However I always keeps it in that "thickness" and thin it when it gets too thick, because making nail art is a precision thing, and both too thin or too thick easily ruins nail art. I prefer to thin mine with acetone since it's the cheapest and easiest.
My conclusion is that I find them equally good and I'd go for the one with the best price or is on the same site as other favorite polishes are at.
For a bonus I also wanted to show you BK nail art color, picture above, which I've bought through ebay. I bought the white color and it's actually the best white fine liner I've used, mainly because it's a true one coater and I also like that the brush is fairly short. If painting this white on a black base, it stays white and doesn't go "off white" or look light gray or something like that. The short brush make small precision painting much easier. I like this white one better than both Jordana Pop Art's and L.A. Colors Art Deco's white creme fine liners. The downside of BK nail art color is that it's only 5ML and that the brush is slightly thicker than the other two, however it's very high precision.
Hope you nail art lovers (like Natalia who asked me about this) appreciates this post! :) If you have any questions, go ahead and ask!
