To be honest, it is your decision to be made because it's your own money after all. Investing in altcoin is not bad either however since it is a lot risker than Bitcoin you must perform proper research. What makes good investing in Bitcoin is that profit is more certain because even if it dumps, later on it will come back and grow even more you can imagine, to put it simply it is better on a longer time frame. Altcoin, on the other hand, can make a quick profit but also the risk of losing your investment is high that is why the decision must be made by you. And if you are going to invest in altcoin make sure that it must be on the top listed ones cause newly created coins were way riskier.