Correct way of adding taxonomy to a custom post type

Question

Just something I´ve been wondering for a while:

The Codex shows us two ways of attaching a Taxonomy to a Custom Post Type:

1. Using the taxonomies argument in the register_post_type function
2. Using the object_type variable in the register_taxonomy function

Should we use both methods, or is one enough? And do they give the same result?

Answer 1

I did some tests and it seems that we can use either one as long as the taxonomy or post type has been registered earlier in the script.