I myself will choose bitcoin 100% because holding bitcoin in a portfolio is more certain than collecting lots of altcoins, my suggestion is that if you have more capital, the difference is also allowed for solid altcoin and only for short-term hold. Prioritize bitcoin in your portfolio because of the bitcoin price has a good quality in its history
Bitcoin investment is always recommended in this market because this is the safest investment for investors and will help you to make a big profit if you have patience. Don't invest in altcoin right now and stay away from this coin this year because of the huge volatility of altcoin that makes a lot of investors lose money. I think investors only care about Bitcoin and no one is interested in altcoins this time.
Yes you are right and Bitcoin is the only coin that can produce humongous amounts of profit. Only bitcoin has introduced young millionaires to the world. No other coin can do that. Getting rich is no more a time taking or difficult task. Just buy bitcoin and hold it for long, simple as that. By long, it never means decades. If someone buy bitcoins today, he will be rich by 2020 as the halving is approaching us.