Thank you, Slim Cat!

DonnaF, I misremembered. The color block bag is dark cognac on the back side, with a big chocolate pocket over it. More pics here:

I would go for (a) myself. The colorblock bag would function as a statement and less as part of a complement, if that makes sense. The contrast is significant so it wouldn't blend as much. I like the idea of swapping out guitar straps, too.

They're both great options, though. I don't wonder you haven't decided yet!

If you are just picking one, I'd go with the solid dark brown one because it's the most versatile, IMHO. But they are all gorgeous!

I like the botkier, but then I am looking for a colour-block bag with a flap top myself!

There’s something really special about that color block bag