I think one of the best wallet for ethereum is MyEtherWallet? MyEtherWallet.com
yeah, myetherwallet is the best altcoin, MEW wallet can store various altcoin so this wallet is very often used.
Myetherwallet is not altcoin it is wallet.
It can store ethereum and erc20 tokens but for altcoins you will have to use different wallets, not myetherwallet.
OP I would go with MEW as wallet for eth, it is simple and safe.