.com is best for commercial site however google trust more on .org and up them soon see wikipedia and such sites
i think that .com is more effective that a domain.org (most of my sites are .com, i don't have any site with .org domain)
.com is probably better because people remember it. They both rank really well in Google, but when someone thinks of a domain, they usually just asssume .com
If you are looking for business development, then go for .com .org for article related site. For selling, .com will work
I believe that. Com is more valid than. Org. Not with. Org is no commercial. -------------------------------------------------