Sub domain or subfolder which is more SEO friendly?

[MitradebanjanSEO]

[FONT=&quot]I am little bit confuse on sub domain and sub folder, which is the best choice.[/FONT]
[FONT=&quot]1. My website all ready have page rank 2 .Now I want create some more section in details. Should I go for sub domain or sub folder? Which one is better?[/FONT]
[FONT=&quot]2. My another question is did my present page rank will follow in all my sub domain or I have to promote individually all sub domains and what is case in case of sub folder ?[/FONT]
[FONT=&quot]3. What you thing which is easy to remember sub domain or sub folder from the point of view of visitor?[/FONT]
[FONT=&quot]Thanks in advance.[/FONT]

 

[Lovely]

If you use sub domain name you have to start the SEO and link building all over again for the new sub domain.