I think they are complementary. Valgrind is especially useful because you don't need to recompile everything. In other words, you can test what you ship (albe

I think they are complementary. Valgrind is especially useful because you don't need to recompile everything. In other words, you can test what you ship (albeit slowly), and that includes dependent libraries that may have their own bugs. On the other hand, ASAN is essential for fuzzing code.