I love LP leathers and completely prefer dark grey to light grey. To me, the decision comes with texture you prefer on the leather and the lines of the bag. The details on the LP make it more casual to me.
^Sorry sandc...I'll take some of the blame for that. I did think it existed because of the one I found on MuseTen..but its not an option like you said...
My opinion out of the two you are asking about would be the LP because I like the color more.
This is hard...I like the shape of the Nikki, but I like the colour of the LP. I went with LP anyway, it's a little trendier but I still like the design.