It is difficult to say but my top picks for a long term hold are the below:

ARK
PHR (still potential to get in early)
XRP
ETH
IOTA
LISK
HAT (still potential to get in VERY early)

Hawala.Today (HAT) has to be the most undervalued coin at the moment.

With only 337 000 in circulation, a max cap at 7 000 000 coins and an incredibly low market cap of under $7 000 000. The project has an exciting roadmap commencing from Q1 of 2018, a good team, a great product and solid branding.

The only downside to this coin is that it is only available on etherdelta - once it hits Cryptopia/Bittrex this will moon 100x in a week.

Am I missing something?