You should use apt upgrade when you want to:
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Update Installed Packages: Upgrade all currently installed packages to their latest versions without making any changes to the package dependencies or removing any packages.
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Safe Upgrades: When you want to ensure that your system remains stable and you prefer not to remove any packages or introduce new ones.
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Regular Maintenance: As part of routine system maintenance, to keep your software up to date without the risk of altering the existing package structure.
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No Dependency Changes: When you are confident that the upgrades will not require any changes to the existing dependencies, making it a straightforward upgrade process.
In general, use apt upgrade for regular updates where you want to maintain system stability and avoid potential issues that might arise from removing or installing new packages.
