I have to choose Session Save - 'Files' or 'DB' while installing Magento2
What is different, advantage, disadvantage?
What should I choose?
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This is explained pretty nice in the Magento Devdocs (actually the functionality is the same as in Magento 1):
In the Session Storage Options section, click one of the following options:
File to store user session data on the file system in the
[your Magento install dir]/var/sessiondirectory. File-based session storage is appropriate unless the Magento file system access is slow or you have a clustered database.
Database to store user session data in the database. Choose database storage if you have a clustered database; otherwise, there might not be much benefit over file-based storage.
We should use Redis for our site.
1) Reduce stress to the website database.