I use iCloud Keychain for my Apple devices because it's free and easy to set up. It offers a lot of security features like secure passwords, two-factor authentication, and passkeys. However, if I have an Android phone or a Windows PC, I would choose 1Password due to its cross-platform compatibility and more control over password security. While iCloud Keychain is suitable for Apple users, 1Password provides a better experience with apps, extensions, and the ability to manage multiple vaults and passwords. Overall, both options are secure and reliable, but if you're an Apple user looking for a free solution, iCloud Keychain is a great choice. On the other hand, if you want more control over your password security and cross-platform support, 1Password is worth considering, even with its premium pricing.