Oddly enough I'd say coinbase is the safest location for your Eth as its fdic insured so they have to replace the funds if they lose them.
On Coinbase, it is not possible to store ERC20 tokens, only Ethereum. And in order to get tokens on your balance, you need to have a purse registered at MyEtherWallet.com. But it is better to enter your wallet through Metamask, so that your private keys are not stolen.