Okay, the Ethereum Wallets are always linked to Etherscan? Then MEW and Metamask are just virtual media to check your ETH wallet?
Your wallet address is stored in ETH network and all the online wallets like MEW, MyCprypto, Metamask and others are just interfaces to access your wallet. So no matter which one you use. But if you need to send your tokens to exchnages, than you need to use MEW. There's no possibility to do it using Metamask. And in most cases you need to add the tokens to MEW using token contract address, before you can see them.