In my own opinion, the best coin in 2021 is Bitcoin because it is already stable and established. It is still the highest value among the other cryptocurrencies. It is one of the oldest cryptocurrencies that is why it has the huge advantage among its competitors.
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For you the best altcoins is Bitcoin because price is stable when OP is questing about profit and gain. I don't agree with you, we have so many names more than Bitcoin profit.