They are both nice shots. I prefer the B&W myself. My eyes are drawn to the sign. It has a feel from another era for me. Course the color one has more things to look at with that additional lighting in the window. Is that a reflection of the sign or another neon sign inside?
i like the b&w, but after playing with it in photoshop... you could use the sponge tool to desaturate the whole picture apart from the sign. this way you could have a b&w picture of the building, but the sign in color. also, if you do this you may want to dodge the corner of the building where the sign is.