it is worth adding that although both of these options are bad, but there is a big difference between them. Coinbase is not a wallet but an account since they control your keys and you only have an account which they can close. but blockchain.com does not have any access to your keys so they can't close anything.
I know it, since i use both of them back in the past. But since op wanted to know web wallet then these two should be good option and they both quite popular too.
I also already mentioned this one just in case
Only use them if you want to store it for short time or do daily trade.
Is not a bad option to store your coins for short time or do daily trade.
you should back up your seeds and enable 2FA.
FTFY.