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ERC20 and ERC777 tokens are the two tokens of choice for fungible token development. The choice of a token mostly depends on usage, adoption, features and security. ERC19 is the most widely used standard for creating tokens in the (Ethereum Request for Comments 20) ERC 20 is the base standard or default standard, immutable and widely used in the development of smart contracts. The ERC 777 standard is backwards compatible with ERC-20 and is improved features and backward compatible.