Prismacolor of Blick art markers?

I have a set of 12 prismacolor markers, which I LUVLUVLUV, and wanted to get a few more for christmas. should I buy an additional pack of those and some individual greys, or a 48 pack of BLICK art markers, which work the same but only have 2 nib sizes, and are much cheaper? It's my impression that they're essentially the same, but just wanted to check. THanks!