I will always shill for Bitwarden and will die on this hill. Free for most features and for $10 a year you get TOTP generation and the integration is so bloody well thought-through. Insane value and two thumbs up (or three, if I move to Fukushima).
Because it's more secure, and portable. A password manager can fill information on programs and apps as well as the browser. It's also separate from the browser, so you don't have a single point of failure. Idk about now, but several years ago when I did use the Chrome password storage, a malicious user could retrieve passwords from the browser as long as they had physical access to the computer.