Write SQL query to solve given problem: Among the movies directed by Wolfgang Reitherman, which one of them was the most popular?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.movie_title FROM director AS T1 INNER JOIN movies_total_gross AS T2 ON T1.name = T2.movie_title WHERE T1.director = 'Wolfgang Reitherman' ORDER BY T2.total_gross DESC LIMIT 1