Directory submission is the more strength in SEO,because it a long time process for increase ranking of your keyword.

As Far As I am concerned Forum is More powerful in SEO (Search Engine Optimization). Because In Forum we can post Threads and we can reply to the Threads.

I choose Forum than Directory.

both have their own status at par:
I will suggest you both because directories help you to examine while forums are one of the effective tools to generate backlinks.

i thinks directory is best.

very much informative post thanks

directory is used for ranking website good and also it gives traffic and Forum Posting is used to rank keyword up and also brings traffic to our website.