In Argo CD 3.6, which diff strategy do Applications with the ServerSideApply=true sync option use by default?

Answer: Server-Side Diff

Explanation

Argo CD 3.6 turns on Server-Side Diff for every Application that uses the ServerSideApply=true sync option. It runs a Server-Side Apply dry run against the API server and compares the result with the live object. The Structured-Merge Diff strategy those Applications used before has been removed.