Site Collections vs SubSites - SharePoint 2013

I am re-organizing my division SharePoint site.  Currently it has extremely light use.  There is 1 site collection and the 7 department/regions share this Site Collection.  There are no sub sites.  Since they are 7 distinct teams with minor overlap am I better off creating 7 sub-sites or 7 Site Collections...Lets just call the 7 teams US East, US Midwest, US West, US South, CANADA, Ireland, and England.

The tasks performed for each region is basically the same for each group, but focuses on the vendors for that particular region.  The only overlap is some training documents, announcement, etc.

Any suggestions to provide a a current SharePoint site that allows the 7 regions today to operate independently of each other (subsites or site collections ?) yet also be flexible.  As an example if someone in Finance from Ireland wanted to look at all Product A Invoices for the month of May for all Finance regions that have aggregated information on Product A.
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Ingeborg Hawighorst (Microsoft MVP / EE MVE)Microsoft MVP ExcelCommented:

If you need to report across all regions, then one site collection will be easier to handle than different site collections.

I'd be inclined to keep the data on one site, in one list even, and create views where each region will only see the data they need. That will be easiest for reporting.

cheers, teylyn
martushaProduct managerCommented:
You could leave training documents, announcement, etc. that is general for all regions on the homepage, but create sub-sites for every region if you don't need to set different language settings for some (for example using French language pack to make one site collection in French).
To find all information on Product A (or smth else) you could configure Search. But if you need all this information in one document as a report, you could use 3rd party tools, that generates a mail merge report for you (for example JungleDoc).
upobDaPlayaAuthor Commented:
Thanks for the input.
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