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Google+ Sign-In Button is leading in Top 10K Sites and The Entire Web.
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Facebook Login is leading in Top 100K Sites and Top 1M Sites.
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Google+ Sign-In Button has better usage coverage in more websites categories. Including Computers Electronics & Technology, Science & Education, Jobs & Career, Business & Consumer Services and 10 other categories.
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Facebook Login is leading in Arts & Entertainment, Games, Lifestyle, E-commerce & Shopping and 6 other categories.
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Google+ Sign-In Button is leading in most countries, including United States, India, United Kingdom, Japan and 125 other countries.
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Facebook Login is leading in Brazil, South Korea, Poland, Italy and 22 other countries.