2 Stragegy's, which one is best?

I would like to know what are the pro's and negatives on both stragegy's

Stragegy 1
Having 6 different websites that have a urlname like this:
1. Company name.com
2. Company name subject1.com
3. Company name subject2.com
4. Company name subject3.com
5. Company name subject4.com
6. Company name subject5.com

The main website is a big blog page. Two other websites are small blog pages and 3 websites are for business.
The layout is the same on all sites.
On the main website is a menu that links to all other websites.
On the other websites, there are only links to the main page. This is because my client dousn't want to throw to much information to the visitor.

Stragegy 2
Having 1 big website, where all different subjects are pages. The structure becomes like this:
Company name.com/subject1
Company name.com/subject2
Etc..
Within each page create a different menu.

Thanks in advance for any help

Jeroen