For my money the best 3 in no particular order:
1. ETN (Electroneum) - Mobile crypto currency breaking through the barriers of mass adoption with their instant payment system. Vendors and customers will be able to use ETN to pay for everyday items instantly. Amazing and great value right now.
2. PRIV (Privcy) - Fantastic community, quality coin with steady improvements, nice features. Currently in Wk17 of 20 Airdrops. For those valuing their privacy this is a beautiful project.
3. Ethereum - The backbone of the Altcoin market, this one will always be rock solid and ready to perform. Definitely worth investing and valuing this one.