I use Bitwarden for general password storage and Keepass for some specific usecases and as a backup.
For the sake of us, uninitiated folks, how is storing passwords through Google account password manager differ from using these password managers?
You want your passwords to always be encrypted. Since your browser's password manager does not have a separate password/key to unlock, your passwords are not encrypted while your browser is running.
On dedicated password managers, you can set them to time out/lock your vault after a certain amount of time.
You also cannot transfer out of Chrome if you wanted to use Firefox some day. Google, of course, likes this as it locks you down to their products.
It also notifies you if any of your password is found on the latest password dump leaks.
While this might seem like a nice feature, this of itself tells you that the password management is not zero knowledge. Bitwarden doesn't know your passwords. All encryption happens client-side and there is no way for someone to read your passwords off the BW server. Google, of course, can read your passwords, which means there's an entry way for a malicious actor to do the same.
Zero knowledge is the only password storage technique I can fully trust. The only downside of this is that you lose your account if you forget your password.