Bitcoin is always a good investment because of its good value and because its marketable, but nowadays, it's a better asset for long term investment because it takes time for it to heat up and surge in value. Its trend usually show that it would dump and dump for a while with little gain until it again opens the flood gates and gain a staggering increase in value. Having said, I would say that it's better to invest in altcoins right now because they show more promise of giving a quicker return of investment.