Previously we had to understand that bitcoin and alts were different, they had a different focus on work. But there are some coins that are said to be substituted for bitcoin, namely litecoin. Although I did not find that litecoin is better than bitcoin because the main bitcoin network is higher than litecoin. While Doge coin is also assumed to be the most suitable coin as a payment tool than bitcoin but the fact is that bitcoin still dominates the cryptocurrency market.

ETH, EOS, XRP, NEM, they are different. Their main goal will not replace bitcoin, but it will serve as an alternative to crypto. in fact, they also accept bitcoin as the main transaction.