I think digital gold is BTC, silver - LTC, bronze DOGE, oil - ETH, gas - DASH 
But I love the MC because it is BTC copy but very cheap https://bitcointalk.org/index.php?topic=1949232.msg19364178#msg19364178
one coin to rule them all that is bit coin But I love the MC because it is BTC copy but very cheap https://bitcointalk.org/index.php?topic=1949232.msg19364178#msg19364178
