Meta Rel Home
2,974,354 websites

Meta Rel Home is free to use

http://microformats.org/wiki/rel-home

By adding rel="home" to a hyperlink, a page indicates that the destination of that hyperlink is the homepage of the site in which the current page appears.

VS

P3P Policy
2,537,460 websites

P3P Policy is free to use

http://www.w3.org/P3P/

The Platform for Privacy Preferences Project (P3P) enables Websites to express their privacy practices in a standard format that can be retrieved automatically and interpreted easily by user agents. P3P user agents will allow users to be in...

Market Share by Top Websites

1 Meta Rel Home is leading in Top 100K Sites, Top 1M Sites and The Entire Web.

2 P3P Policy is leading in Top 10K Sites.

Websites Categories

1 P3P Policy has better usage coverage in more websites categories. Including Arts & Entertainment, Computers Electronics & Technology, Games, Adult and 14 other categories.

2 Meta Rel Home is leading in Science & Education, Community & Society, Health, News & Media and 2 other categories.

Geography

1 Meta Rel Home is leading in most countries, including United States, Germany, Japan, France and 150 other countries.

2 P3P Policy is leading in South Korea, Russia, China, Taiwan and 7 other countries.