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Use THEN RETURN for returning data from INSERT/UPDATE/DELETE statements. This reduces the number of round-trips to Spanner for most use-cases. THEN RETURN clauses are not supported in BatchDml, which means that multiple DML statements that need to return values are translated to separate DML statements, instead of a BatchDmlRequest followed by N SELECT statements. Even in those cases, using THEN RETURN reduces the number of round-trips by 1.
The fact that Batch DML does not support THEN RETURN is the main reason that it is recommended to use client-side generated UUIDs for primary keys when using Entity Framework. This will allow DML statements to be batched.