I own a lot of nail polishes in this dark silver/graphite family. I am comparing Illamasqua Snap, Essence luxury secret, Essence icy princess and Orly Seagurl. Icy princess is obviously much lighter and sparklier/shinier. Tonally luxury secret and Snap are very similar but the formula on Snap is much easier to use. Seagurl is darker again and slighter warmed in tone. In my experience its prone to chipping but is a nice colour to wear and a good formula to apply.
The first two polishes are one coat, the icy princess is 3 coats and seagurl is 2 coats. I think that luxury secret and snap are very comparable. My pick is the Illamasqua Snap, but it’s about 10x the price for 2x the polish so the Essence is a very good cheaper dupe.