The decision to use subfolders and / or subdomains can be considered as marketing and account information architecture, which relies heavily on how you want the content of your site to be recognized by search engines and how you want to put you on the web for maximum profitability.Subdirectory is like a description of a page or pages of the site whereas Subdomain is like completely new site in a domain. For example, you can create your own website already exist in subfolders, or you can create a whole new site using a subdomain.
When to use Sub domains :
Subdomains should be used when you have enough vertical content to support an independent website. Subdomains are effective because they piggy back on the value of the root domain, whereas if you bought a new domain, that age would have no authority. In addition, there are things only you can do from a SEO perspective. Google considers subdomain as a different site than main site so the only care to be taken when creating sub domain, also create content semantically different.
Subdomains can be a good way to catch brand based searches. Also subdomains are good for marketing in geo locations like you can assign an IP address to a subdomain and also can asset geographical preference in Google’s webmasters tools. Sub domain can be a good choice when you have well established site and if you want to expand it further in topics that are not more related to the main site.
When to use Subdirectories:
Subdirectories are a good choice for organizing the content in meaningful and descriptive direction. If you are looking to expand your site and categorize content in a lot of meaning, of course, and sub-directories are a good way to do more research that make your URL more search friendly.
Using sub-directories can be easier to manage the website than some domains in technical manner. Also subdirectories are much easier to get ranked, and to encourage the conversion of traffic compared to the number of areas and therefore some companies want to maintain their unique brand and is present in all its business niches, or in countries that provide services in both cases, most important SEO consultants and advertising agencies to propose the first sub to help them acquire a good ranking faster.
In the end, no one is much better than but both have advantages in their manner. If you want to build entire new site with large content then sub domain is a good option for you otherwise subdirectories can be the best option.
