Always diversified way of investing is the one that can let us grow, rather than keeping hold of a single asset. Altcoins were the one that creates possibility to earn. Price moves at present is peaking with bitcoin compared to that of the altcoins that always have the dependence upon the market of bitcoin as well.
Investing in either bitcoin or any of the altcoin is no doubt really a very good choice the thing it is you who has to make the decision according to your own personal skillset and the way you are planning the things. If you are planning of playing a safe game and you are least interested in getting into this stuff of trading, then bitcoin is the most appropriate choice. On the other hand, for trading altcoin is the best option.