To me it has a sweet scent of liquorice. The performance is very good (what you expect from Proraso), but the fragrance is simply not for my taste. The Green is my favourite.
I haven't smelled the Nivea, but the scent of the Blue is different for sure. The Blue is the only Proraso I've tried from tube instead of tub. The lather from the tube seems to be thicker, which I like. I do like the scent of the Blue over the White and my skin seems to like it just as much.