BLUE!
I bought a camel/tan colored SDJ and I bought that color because I thought neutral is more safe and classy but I soon realized that it looked so boring. I honestly wish I went with red or blue (the blue in your photo is what I would get!).
As for investment.. I don't know.. I think the lighter shade may show wear and tear more down the line so maybe blue will hold a little more value over the pink..
And I had NO clue that SDJ had slouchy kinds?? I mean, don't people buy it for the structured look?