What Passwords Will iCloud Keychain Leave If I Disable Keychain?

I’m thinking about the pros and cons of Apple’s iCloud Keychain. If I enable it and start using the Safari suggested passwords, then decide after using the system that I want to try a different Password Manager, and disable Keychain, do you know what passwords would be left, my originals or the Safari suggested passwords?
Do you recommend a Password Manager for my MacBook?
My machine is a MacBook Pro Retina 13″ Mid 2014 with macOS Mohave 10.14.4.
Thanks for your help.
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Tom