It is the pioneer in cryptocurrency so the buyers think that bitcoin is safer that those new cryptos. It is the best investment for those traders because of high growth rate. And no one owns bitcoin unlike those ICOs that are potential scam.
For me, what makes bitcoin better than the other coins is for being more accessible. It is the store value if all altcoins. Altcoins needs to be converted into bitcoin so that it van converted into fiat.
And also, bitcoin is the most valuable cryptocurrency and asset to own.😁😊😊