Relatively speaking, I can't see why cryptonote coins can have >10mn in combined marketcap, and SDC only 1mn when it's based on the more compatible bitcoin code.
I am glad you can see that; it is something many other people either forget or don't understand.
Shadow is forked off the bitcoin code-base, that means it is compatible pretty much anywhere where bitcoin is and more importantly it has a mature base.
It is only a matter of time before people realize the gem that Shadow is.