FileInfo.com contains a searchable database of thousands of computer file extensions with details about the associated computer file types. Each entry contains details about the extendable, a description of the computer file, and the program or programs that can open the computer file.
If both extensions are available, then I advice to go for both, as it costs only a few dollars for registration. To have more presence in future you may think about registering the co-extension and learn about the advantages.
If your site is Commercial website.You can go for .com extension...If the site is organization related means you can go for .org extension.You can Better try first .com if it's not available in .com you can go for .org You can register the Domain name at www.whoisxy.com
if both extensions are available i would suggest snapping them both up as it only costs a few dollars a year for registration. to gain more of a presence in the future consider also registering the .co extension and learn about the advantages of it
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Dot com domains are the number one choice for just about any new website. The reason for this is basically the familiarity that the general public has with these types of domains, though the importance of your domain extension may vary for some types of sites.