__get in libraries

As test, make a print_r(get_instance()) and you will get the complete CI instance to access. So it depends on your codedesign and what you will do.

The first example i thik is from class with special needs. __get() is invoked when the method or property you want to use is inaccessible.

If you develop a library you should go with the second way but hey .. thats CI you can choose the way you like.