This ERC20 token is more environmentally friendly and more efficient because in addition to using the ethereum blockchain network which is quite stable, the ERC20 token wallet does not need to sync to the blockchain network. To create an ERC20 token wallet a wallet ethereum from MyEtherWallet is required.
MyEtherWallet is a platform / interface to open ethereum wallet owned by a user that has been recorded in the ethereum blockchain network. MyEtherWallet is not a ethereum wallet provider website but more like a media to create ethereum wallet which then the wallet is stored by the user (download)