Assuming I am linking from one site I admin to another, so I have full control, is there a SEO difference in linking to the "pretty" permalink of a page versus using /?page_id=x
or the "shortlink" generated by WP in the source of the page /?p=x
?
I want to use one of the the latter options so I can avoid 404s when my customers change the slug of a page or article against my advice.