Best way to structure a new company blog with multiple existing individual country sites?

[OnlineAssetPartners]

Hi, we have a client who have multiple business websites .co.nz, .com.au, .co.uk, .com which all have unique content intending to rank in each country. These sites are on a CMS that has a blog function capability.

Should we set up the blog on one of these country sites then link to other sites when appropriate?

OR

Is it best to set up a new blog on something like Wordpress (or what?) that takes all blog posts from all countries and then links out to the relevant sites when appropriate. So the new blog becomes the content hub and creates its own Google power to then pass when appropriate to the various country sites?

Any suggestions welcome especially from people who are currently doing either of these methods, and have experienced the results both positive and negative of the different approaches.

NB: there will be about 20 staff creating a blog post on a topic relevant to them per month each once blog is live.

[AndrewClark]

I'd be inclined to suggest individual blogs on individual domains. Doing this will allow each blog to cater to that countries specific market and better engage your audience. Let's face it, something that is of interest to some in New Zealand is not necessarily of interest to a UK-based market.

Let me know if you disagree and we can discuss further.