Where is it better to put the condition “t2.[p] = @p“, in JOIN or in WHERE?

Question

SQL

Table t2 is large, the condition restricts the sample.

SELECT *
     FROM [dbo].[table1] AS t1
FULL JOIN [dbo].[table2] AS t2 ON t2.[id] = t1.[t2_id]
                              AND t2.[p] = @p
    WHERE t2.[p] = @p
      AND (t1.[id] IS NULL
        OR t2.[id] IS NULL)

Answer 1

perhaps in a subquery to t2?

Answer 2

FULL JOIN implies that all records from both tables are needed,
the WHERE condition will limit the final selection, so it must be set in JOIN