What is a better mobile domain from an SEO perspective an m.example.com or using your regular domain with user agent detection?

[CabbageTree]

Just wondering what domain is more beneficial for a mobile site and why.

[Francisco_Meza]

What this video on Matt Cutts and consider your question answered. (m.example.com)

http://www.youtube.com/watch?v=mY9h3G8Lv4k

[NakulGoyal]

m.example.com is definitely better but if you have responsive design, you can also adjust based on user agent detection and I am seeing a lot more success with that. However, if you do decide to go m.example.com, don't forget to Deny Google Mobile access to your Main Website and Only Allow Googlebot-Mobile access to your mobile site. That way you won't run into duplicate content issues between your main website and mobile site.

[CabbageTree]

Thanks for the help and answers on this Francisco and Nakul!

[JoshAsteteWebFullCircle]

I prefer to use the m.domain.com for mobile sites now and deny Google from searching my main website.   But with responsive design we are moving toward utilizing the same URL for mobile and main websites.