Bitcoin is always better than altcoins, in my opinion. Its having higher price and more stability, despite its price volatility (which is common with altcoins too). But you can invest some of your capital in the highly traded altcoins
With the price of bitcoin so high,it is not the best form of investment if you are looking for a good profit,there are coins with low valuation and good projects which can give you a higher yield than bitcoin,so make sure you find a better alt coin or project and invest in it rather than in bitcoin and that is my opinion.