I will try to be fair as much as possible. I own more than 10 altcoins and I don't want to miss those other coins, especially the new ones, which I think will really become great in the future as they start to unfold their project's objectives. Well, here are my top 10:

1. Ethereum (ETH)
2. Waves (Waves)
3. Monero (XMR)
4. Stratis (Strat)
5. Ripple (XRP)
6. Ethereum Classic (ETC)
7. Litecoin (LTC)
8. Eidoo (EDO)
9. Aventus (AVT)
10. Dent (Dent)