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.