Both.
Paragraph variations are great only when they come with sentence variations.
Here is some great read about that:
www.blackhatworld.com/blackhat-seo/black-hat-seo/444418-wip-calculating-number-times-spun-article-can-realistically-used.html
www.blackhatworld.com/blackhat-seo/black-hat-seo/411372-guide-article-spinning.html