It's better to store BTC on coinbase , it's fast and secured. Blockchain is down sometimes.
coinbase is good place to store your bitcoin, also he give 100% free fee transfer, so you can spend it every day without thnk about "fee"
and coinbase give option 2fa with sms verification, i think it's very safe
It is safe as much as you stay safe, use difficult password, coinbase it's for a long time in the market and i don;t think will bankrupt so it should considered as a safe web wallet.
https://www.coinbase.com/vault
~TIME DELAYED WITHDRAWALS
Withdrawals from your vault have a 48 hour window during which they can be canceled.
~MULTIPLE APPROVERS
Joint accounts can be used for extra security, requiring multiple approvers to initiate a withdrawal.
~OFFLINE STORAGE
98% of bitcoin is stored totally offline, in geographically distributed safe deposit boxes and physical vaults.
I have seen that option but never tried to use it, what do you meant time delayed withdrawals, i can make a withdraw and after 48 to get confirmed?
Im use it for savinf account, if you want to withdraw your money you must waiting 48hours to get confirmed,
example if you submit withdraw Today at 06:41:16 AM you will get your money (btc) in 2 december at 06:41:16 AM