It depends on your needs. If you only need what keychain offers, then stick with it.Or just use Apple’s keychain?
If you want more features , such as accessing your passwords on Internet connected computers where you keychain isn't available , then you want to look at other products.
For me, I often want to access my passwords on computers I may not have full control of, like my employer's laptop, or certain business partners that give me access to linux "Jump Host" that I use to manage their networks and systems for them. Since these are Linux systems, Keychain won't even work on them. Even the Mac computers have iCloud disabled for security reasons.
Sure, I could access keychain on my phone and then type in the really, really long passwords with special characters, or I could install 1Password X and just type my master password in.
I'm not sure why you singled out 1Password , as it's really Yellow Sticky notes vs Keychain vs Everyone else, haha.
I could do a feature comparison, but it would be putting the cart ahead of the horse. First things we need you to list your requirements - needs and wants in an password manager - and from there we can narrow down the list of apps that might meet your needs.