It's bitcoin, no doubt, because there are policies in place to restrict the entire cryptocurrency market.
Bitcoin is recognized by most countries.

But he will not give you the profit that can give altcoins. Look at the same QuarkChain, people were able to make good money on it. I think Fantom will also be able to please those who bought it.
I think with the win Cryptocurrency market will generate big profits. indeed for Cryptocurrency many enthusiasts who support it to make Cryptocurrency become the winner and become a big enough profit in the future. with this will be very capable to make Cryptocurrency as the greatest ruling of profits.