Great post, @boxmining, confidently Resteemed!
It's interesting that those 4 major privacy coins have almost the same total coin supply figures: 18-21 mln. This makes it much easier to trade/switch between them (easier to make price positioning and make the decision to purchase/switch).

But what about NAVcoin? Don't you think it is a great competitor in this niche? Or just too small yet to be included?