Currently at work my company is in the process of splitting current website in two separate, dedicated to different type of products. My question is, what is better option from seo point of view, new domain or subdomain on older domain. From usability point of view new domain is just shorter and easier to remember, but simple 301 redirect will do the trick. In terms of seo I wonder if new subdomain would get all that trust rank from old domain. So my two options are: newdomain.com or longkeyword.olddomain.com Old domain is 9yrs old so if subdomain would be considered as 9yrs old too then my choice would be simple.