In short, as of WordPress 3.3 use wp_enqueue_scripts to load JS and CSS. wp_print_styles has/had some minor bugs with it (namely, it may include your scripts in the admin as well) – here and here are some more details on all of that. It doesn’t sound like there’s any major security flaws or theme breaking here, just better practice to use wp_enqueue_scripts.
Additionally:
- wp_enqueue_scripts – for enqueuing on the front end
- login_enqueue_scripts – for enqueuing on the login page
- admin_enqueue_scripts – for enqueuing on admin pages
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