What are the advantages of external CSS compared to internal CSS Given these situations which type do you think would be more useful for the majority of webpages?

If by "external" you refer to separate .css style sheet files instead of style sheets as parts of HTML pages, the short answer is: Avoiding headaches and redundancy.

You can define one or several complex style sheets and use it for hundreds of pages. Changing one definition will update your whole site.

Also, an external style sheet will be cached, so a user's browser only has to load it once. This saves time and bandwidth.