you see what you do there don't you? you are comparing 4,2 million dark coins to 18 million mro - afaik the total supply of darkcoin after the end of mining will be 21 (or 18) million dark. in this case you could simply take the price of both and compare them 0.00175 to 0.00375. dark market cap is in this case at least 2,25 higer than the one of monero.