Exact match domain or root domain for speedy SEO?

[MarloSchneider]

I am doing SEO for a website that has constantly rotating and only temporarily pertinent subjects on it.  Let's say these information and subject cycles go for about 6 months.  Assuming this would it be more effective to optimize exact match domains for each 6 month cycle or make a main domain with a few of the keywords and just target a page for each roaming subject?

Advantage of the subject is I get domain authority to feed off of, advantage of the exact match is, of course exact match domains are a powerful tool to rank highly and it is only a medium competitive market, usually about 40 domain and page authority.

What do you guys think?  Do you have any techniques to dominate temporary and rotating markets?

[AdamThompson]

I would go for a single domain. That way you get to build up links and authority over time. If you use a new domain for each 6 month project, you have to start over each time with 0 links.

[alexhoug]

I would say build a "brand" of it. Exact match domains are starting to show less significants in the SERPs. So I would say build a "brand". You can also learn some indications of that in a PRO webinar that was hosted within the past three months. You can also see some of the more recent ranking factors (including info about exact match domains) in a presentation Rand did in a blog post here.

[Thos003]

Managing one domain is much easier. But there are some benefits to having exact match domains. Do you want  to run a lot of stop and go short sprints, or one steady marathon?