malloc() and free()

So I was reading a Sepples tutorial for experienced C users and that guy keeps telling me that new and delete are better than malloc and free.
Why? What's wrong with them?

There is no need to cast the result of library functions that return void *; it makes your code hard to read, adds no value, and can hide a bug if you don't have a valid prototype in scope. See http://www.cpax.org.uk/prg/writings/casting.php and http://c-faq.com/malloc/mallocnocast.html