BTC - first, biggest, network effect, known, digital gold
ETH - smart contracts, new way of buisness model, decentralization
LTC - digital silver, second, well known, better technology lower fees, natural alternative to BTC.
DASH - will probably be one of the first mainstream adopted currencies.
XEM - best technology, they call it sleeping giant.
ANS - Chinese copy of ETH, with biggest population, good to have some.
ETC - known, ETH little brother, a lot of investing, known.
XRP - bankers coin, even you dont like it, keep some of them.
NAV - best privacy coin, simple, efficient.
ICN - Digital Assets Management Platform, great potential on mainstream adaption.
SIA - All today's clouds are expensive, risky and limited. SIA project will bring big changes.
ARDR - NXT tech. Easy and secure creating child chains.
IOTA - alternative to blockchain, secure, no fees, intenet of things eco system. Good to own some if this concept prevail over the blockchain in the future.
EOS - technology will be essential in the future to address the scaling issues.
STEEM - The future of social networks. Rewards for good content.
In the comments below, tell me what do you think and feel free to add something that you consider missing in this list. Please, also explain the reason.
Thank you
Good luck