It of course makes sense from a convenience perspective to use your browser’s integrated password manager, such as that in Google Chrome. And although it is a perfectly solid choice, there are various reasons why you may want a dedicated password manager instead or in addition to your browser’s.
Firstly, your browser’s password manager will likely not work with other devices quite so easily.
If you use Google Chrome on a desktop and have an iPhone, then passwords associated with apps will not be saved to the manager in Chrome - by default they will be saved to Apple’s own password manager, Keychain. Keychain and Chrome password managers will not sync together, and there is no browser extension for Keychain that will work on Chrome. Therefore, you will be running two managers concurrently, one used for mobile app passwords, and the other for website passwords. If you have an account for a service that has both a website and an app, then they will be saved to both managers separately.
As you can imagine, things can start to get messy and disorganized fast. The solution would be to have a dedicated, third-party manager like those on this list, so they can centralize and sync all your passwords for both websites and apps across all your devices. They will usually have an app for mobile and for desktop, as well as an integrated extension compatible with most common web browsers, so no matter what platform you’re on, you’ll always have access to your passwords.
Secondly, dedicated password managers often come with a lot more useful extras. For instance, a small but useful feature of many password managers is the ability to give a nickname to your account passwords, so you can locate them easily. Sometimes, you will find that searching for your account credentials by username or by the URL that the account is stored on may not yield the results you're looking for.