I generally prefer to hold tokens where there is a potential reward for the user holding them (e.g. REP) rather the mined currency types (e.g., BTC, XMR) because with theses they effectively tax you instead of paying a dividend (the 'tax' is the inflation which is required to pay for the mining which can be very high). So, my holdings are mostly of the former category, whereas BTC and ETH (until it switches to Proof of stake) I mostly just trade.
Here's a list of most of my main holdings right now: STEEM, PPY, ETH, LTC, BTS, XTZ, EOS, GNT, REP, GNO, DGD, BNT, EDG, ICN, MLN, TKN, ICOO, OBITS, GBYTE :)