I don’t know if Google has a personal preference per se, but blogs definitely appeal to the nature of Google. Tan Kian Ann put together an awesome list and also compiled some of the greatest explanations of this theory on the web in his article, 10 good reasons why Google loves blogs! Here’s his list:

1. Blogs are full of archived information
2. Blogs are updated frequently
3. Blogs have good and relevant incoming and outgoing links
4. Blogs have a clean architecture
5. Blogs are focused on content
6. Blogs have lots of comments which add to the content
7. Blogs carry advertising for Google
8. Blogs focus on a niche topic
9. Blogs are (well, supposed to be) honest resources
10. Blogs have timely content (aka the hottest news)