yeah, besides mozart. it's a toss up.
beethoven has personal triumph over the aristocracy, whereas mozart was barely getting out of that and sufferred for it more. brahms, well he may have been just as stoic about love as beethoven, and sufferred similarly, but his belief in the ressurrection of the dead was acknowledged greatly by the requiem he wrote which is one of the most beautiful, imo, expressing verses directly out of the bible. in other words, he truly believed that there was hope in the end. Beethoven once considered suicide (due to deafness beginning - so he didn't accept fate as something to be calm about) and Mozart a little crazy (but i can relate). Brahms was steady. he sufferred but he didn't complain much.
one similarity, though, might be that beethoven took such great care of his nephew carl, and brahms had similar kindnesses to clara. they were very trustworthy and caring people.
beethoven's successor was probably someone like mahler or someone who wrote a lot of symphonies. someone who thought on a grand scale. it's really odd, but i think of bernstein as having been a sort of modern day beethoven. correct me if this is way off.