OPI 'Planks a Lot' or 'Do You Lilac It?' 10 points :)?

Hey everyone! So, I'm looking for a purple nail polish and have settled on OPI - either 'Planks a Lot' or 'Do You Lilac It?' I think both colours are really pretty, but I've heard that Do You Lilac It is more of a smokey, greyish purple. My skin tone is beige, so which do you think would a) look better on me and b) which do you prefer? 10 points for best answer :)