Exchange DAC mode benefits

Hi folks, i'm doing a bit of testing in a lab with DAC and it behaviour.

My question is, could something tell me the benefits of have 2 DAG members in each of  two  datacenters, instead of having 1 DAG member in each datacenter...besides high availability of course.
Is the DAC process better or different, having 4 members across two sites instead of 2 members across two sites?
Raymond BrooksAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:
There will be a small delay in case you have only single sever on each site.
There will not be a delay if you have 2 servers in each sites. database will switch over to next datacenter only when both the servers fails in the site.

please check these as well
https://social.technet.microsoft.com/Forums/exchange/en-US/c78dadeb-07a0-4bdc-a6e0-31a570ca4c63/query-on-dag?forum=exchange2010 
http://blogs.technet.com/b/rmilne/archive/2013/12/04/dac-and-should-i-enable-dac-for-a-dag-in-a-single-ad-site.aspx

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