New Domain VS New Page Backlink?

[Sam.at.Moz]

Assuming you've already got a link from:
sitea.com/page1 (Moz domain rank 55, Moz page rank 30)

You have two choices for another link:

1. Another link on the same domain but a new page:
sitea.com/page2 (Moz domain rank 55, Moz page rank 30)

2. A link on a new domain but with a lesser domain & page rank
siteb.com/page1 (Moz domain rank 30, Moz page rank 20)

Assuming you have no other links to your site - both sites are relevant to your industry, both 5 years old, both have the same number of visitors/external links/ads and the content and anchor text remains the same.

Which will have a bigger impact on SERP movements?

Sam

[TomRayner]

Hi Sam

Of course, this is all theory work, but I would say option 2.

If we look at the most recent Moz Ranking Factors and the Searchmetrics Ranking factors, we can see that # Unique cblocks Linking to the Page, # of Unique IPs Linking to the Page, # of Root Domains Linking to the Page (Moz) are among the strongest correlations for higher rankings.

Certainly from my own experience (and ultimately it's your own data that you should trust the most), I have seen rankings increase more consistently when I have earned links from multiple domains/IPs, as opposed to, say, 3 from the same website.

Your mileage may vary, but in most scenarios I'd look at option 2 as the better option.  Of course, you need to do all of your quality assurance to make sure that it is the kind of website you would want a link from, but if it is then go for it.