New domain or old domain

I have a client who has a domain which is based on his business name, lets call it businessname.co.uk
He also owns another domain with a keyword lets call it keywordA.co.uk

businessname.co.uk rates well for a range of keywords and is on page 1 position 4 for keywordA. He is going to be extending his site to develop different content around the subject matter of keywordA. Our first thought was to use the new domain name and focus solely on this keyword. This would also have the benefit of having a double hit on the search pages. Would

  1. keywordA.co.uk get any real benefit from being linked to from businessname.co.uk and would this make the rankings of businessname.co.uk reduce.
  2. or would he be better to have the content added to businessname.co.uk and have keywordA.co.uk redirecting to the apropriate section of the site?
    Any suggestions would be really appreciated.

i think keywords related domain name is more effective …

I guess if your client manages to work on the first top-ranking site, businessname.co.uk and then adds some new content pages to that, targeting the additional sets of keywords, some better outcomes would be achieved than working on second domain name. This actually has been a discussion among webmasters and many believe that trying to expand new older domains which have top ranks is better than focusing on some new projects.

Of course you did not mention how well the second site is currently doing online, how old it is and the links pointing at it but if your client seems satisfied with the first website, through dedicating one or more of new content pages to the additional keywords and building links for them, after a while you will find them to have their individual ranks, helping the homepage. Your second site can also redirect visitors to the primary site.

i think keywords related is more important then other but if other is 301 redirect to this domain and its more powerfull then one domain.

The domain name must contain the right keywords to get more visibility. With the proper use of keywords related to your business, you have the opportunity to make your site search engine friendly.

Domain Name plyas main role in SEO. According to Me right keyword in domain name is required. and if your domain is old, if your site is old you can get better rank and traffic.

I agree that you should do 301 redirect from old to new domain name- by this You will keep still good ranking on google . I also think that the domain name is very important for good SEO and also very important to attract people by its name

I agree. the strongest would be the keyword competitors than the domain.