I prefer bitcoin portfolio with a little of other altcoins. I'm confident with bitcoin for it has proven over years of its outstanding performance. All other altcoins are still promising. Its better also to have it in time that its price is still very affordable. Indeed, its really best to have it all but more of bitcoin to have many options in case one fails.
I agree with you. Bitcoin investment is predicted to be very promising and the profit this coin brings us is really great so if you are considering investing, buy now. In addition, some altcoins such as ETH, BNB, ATOM should also be considered more because these coins are always held by many investors and will definitely increase in price someday.