Canonical Tag
13,171,026 websites

Canonical Tag is free to use

http://en.wikipedia.org/wiki/Canonical_link_element

A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".

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Meta Robot
11,069,238 websites

Meta Robot is free to use

https://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag?hl=en

This page contains a meta robots tag which tells search engines and robots to index or not index the page.

Market Share by Top Websites

1 Canonical Tag is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, Meta Robot is clearly lagging behind, losing to Canonical Tag in all segments.

Websites Categories

1 Canonical Tag has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Science & Education, Food & Drink and 19 other categories.

2 Meta Robot is leading in Reference Materials.

Geography

1 Canonical Tag is leading in most countries, including United States, Japan, United Kingdom, France and 151 other countries.

2 Meta Robot is leading in Germany, China, Czech Republic, Hungary and 6 other countries.