One blog or multiple?

I'm looking into making a content website, with PLR articles I've re-written. But I'm not sure how to go about it.

Should I..

A: Use one Wordpress blog, and have all articles on that blog, but put into different categories.

B: Use Wordpress Multi-Site and have a different blog for each niche.

I think B sounds like a better way to go, but I'm just unsure what to do with the main blog.

Any help would be really great

I think one account will be better rather multiple as you have only to do SEO for only one site.

I did think about that, however, doing SEO for a multi-topic website is a bit harder than doing it for one niche.
Having multiple websites also means you can test out different ad networks and ways of earning.
You also get paid higher from ad networks when you have a niche, because it's targeted instead of all over the place..

But I still.. Have no idea.. what to do with the main blog XD

i think you option A its more nice too me. it would be easier to do the SEO
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i think multiple bester

B: Use Wordpress Multi-Site and have a different blog for each niche.

If you're having subdomains for each niche then wouldnt you have to build backlinks to each of the subdomains?. Then if thats the case then you're best to stick with just website.

First of all, any given niche deserves its own domain. So, I'm assuming that your top-level idea/niche (i.e., the idea/niche that ties/holds everything together) should be related to the domain name.

Next, look at your domain as one publication. It will help greatly if you consider yourself a publisher and/or editor-in-chief. So, the problem becomes a matter of designing a coherent publication that a group of people will like to read.

As to its structure, this publication has a front page which is reachable through its domain name and several sections (or columns) similar to real-world newspaper or magazine which are reachable through sub-domains. Several major/permanent sections are expected and several minor/optional sections may be added from time to time.

Anyway, this is how I've solved this problem. I have several publications consisting of clusters of blogs with different sub-domains. They are held together by a menu that shows the major sections and the sidebar that shows the minor sections or supplements.