Opinions wanted!

We thought we had our fireplace all sorted out and ready to be tiled, but we second guessed ourselves and have decided to use Carrera Marble tiles instead of white ceramic penny rounds. But we are torn between the mini subway tiles and the 1x1 marble mosiacs, and bummed that both will take 3 weeks on special order to receive... Which do you prefer? We will be using the trim in the middle of this picture around the ledge:

1x1 inch square carrera marble mosaic:

Mini subway tiles: