Like .vs Share Button - for SEO which is better?

[activitysuper]

I personally from what I have read believe the share button to be more powerful when it comes to SEO but I don't know for a fact so anyone have any input on this subject?

One thing I do know, is it's a lot harder to gain a 'Share' then a 'Like' and im talking about these buttons being onsite maybe in a blog post.

If you gained 100 shares and 100 likes which one would generate the best signals?

Thanks

[TomRayner]

Seems that way, but therein lies the value and appeal.

Harder to get, but more valuable when you do.  It'll be equally as hard for your competitors and others, so if you can crack it, it's a great string to your bow.

[activitysuper]

Nice, thanks.

Looks like shares are still top of the list then, also seem to be one of the hardest to gain.

[TomRayner]

Going on the 2012 Searchmetrics ranking factors report, the correlation in data would seem to suggest that 'shares' carry more 'value' than 'likes:

http://www.searchmetrics.com/en/white-paper/google-ranking-factors-us-2012/

The data is coming up on a year old now, but I can't see why it would have changed this year.  I would point out, however, that this an aggregated score and it is a correlation, rather than any quantitative evidence.  Results in your niche may vary, but it's a pretty decent indication.

You'll also need to be aware that you can't really force a user into one sharing/liking output - let them do as they please.  An A/B test in share banners containing facebook likes and facebook shares might be interesting to run.