With a history of development, Bitcoin is the king of digital money. In this area, investors have a stronger belief in bitcoin than any other currency. Altcoin tends to be more than but it doesn't threaten the existence of bitcoin.
And I am sure that every experienced investor will prefer to buy Bitcoin than any other altcoin. I do not want to say that there are no prospective coins among the altcoins, but still they are very hard to find. Better not to risk and choose Bitcoin