I usually prefer bitcoins trading with altcoin in exchange market. Some of the exchanger sites gives you best insight of what market will be like I'm coming future. I usually buy bitcoins at low prices and then only go for altcoin exchanges. This gives me bigger windows of profits firstly by buying at low price (that's from reducing/covering fees) and secondly going higher on the charts i can buy more amount of altcoin. Well over all this is my strategy and this is what works with others too. Hence people are more into trading and investment of bitcoins.