Pretty much any coin that you mine could be exchanged into the coin that you would prefer to hold for the appreciation. So: * Mine whatever is most profitable

Pretty much any coin that you mine could be exchanged into the coin that you would prefer to hold for the appreciation. So: * Mine whatever is most profitable to mine at that time. * On mining that coin, convert to whichever investment vehicle gives you the risk/return that you want (BTC, ETH, XLM, VFIFX, US T-bonds, etc).