Brahms is usually a contender for top rank because of his four symphonies and two piano concertos, which are symphonies in themselves.
I usually find that top ranked composer lists neglect Nikolai Andreyevich Rimsky-Korsakov which is a shame. He was a great original composer of symphonies and many continuously popular and original works, plus he orchestrated the works of other composers and made them popular to the public as a result. He deserves props for his chops and ops!