Bitcoin would be cool for the long term. However, there are equal opportunities with altcoins, they could be yield reasonable profit within short-term or probably long-term. Do your personal analysis and proceed with your decision. I wish you all the best of luck!
Both altcoins and bitcoin are good to invest so i prefer to choose both and aside from that its safer to invest on it becasue we can really sure that our money invested will earn a big profit.