Bitcoin is always a good way to invest your money, especially if you go for the long game. Also, other alt coins like ETH, Monero, Waves etc. have great value already and it will increase in the future but you can get in the trading game with them and make quick profits.
It is not the good way to invest money but the best way. Nothing has ever proved to be this much profitable as bitcoin has. Bitcoin has made all of its holders happy.They all have high hopes from it and to be very honest, the chances of their expectations being fulfilled are really high.
It has become a source of income, investment and saving at the same time. The mentioned altcoins are good but miles behind BTC in every aspect.