I disliked Chang and his religious fanaticism- crediting God for his success every single tournament was going a bit far. But he is definitely better than Ferrer for sure.
Of course. Chang was seriously competitive with the best of his time, reached 3 gs finals and won one, was world # 2. And he played legendary matches, Chang vs. Lendl 1989 is one of those historical events that won't be forgotten. By contrast, I wonder how many people will recall a Ferrer match in 25 years.