The World is changing, and so is the economy. In my opinion, it is good to have a diversified portfolio. Hence, I currently hold 50 different altcoins.
Nevertheless, here is my top 10.
Ethereum
Bikercoin
Syscoin
Unobtanium
Antshares
Ripple
Litecoin
Zcash
MaidSafeCoin
Monero
Since December 2016, I earned 104.83 %.
If you want to take a look at my portfolio:
https://cointracking.info/portfolio/Coin345/I use Cointracking to keep track on my trades and build my portfolio. You can use my referrer link to get 10% discount for all account upgrades:
https://cointracking.info?ref=J623640