I'm thinking about Byteball (still unpopular, but I like features that they offer) and BTC.
Last but not least is Dash, it seems to be a rising star, b.c. I see that increasing number of exchanges and crypto-ATMs support it
I think the bitcoin is the better option to start with the crypto currency investments because altcoins were much riskier and more volatile and just depends on the bitcoin price movements for most of the time so learn the market well before inveting on altcoins.Include Monero,litecoin,Ethereum,EOS into your consideration.