There's nothing wrong with having either, but the former allows your visitors more access other than the personal preferences of a rope ladder. They can also navigate comfortable in the simple space of your home without being distracted and lost in personal nik-naks. A useful thing if they are only visiting you for a singular purpose.
Sid Lee Architecture understands this and has a beautiful website. Good Type too. Although it is made with Flash and therefore loads slower than a turtle without the proper ninja training.