I always try to choose .com, if they are available. This article just sums up all the reasons to choose .com over .net or other domains. I believe you already know most of the reasons, it just may help you decide.
When choosing a domain name, purchase a name with the ".com" extension. Here is why:
* Your domain will just look better with the ".com" than any other TLD.
Most people take ".com" websites more seriously than those with any other extension just as a man wearing a tie will be taken more seriously in most conservative circles than if he was wearing a bowtie or scarf.
Many companies decide to change the type of their organization just so they can have "Inc." printed on their business cards and
letter heads. It just looks better, smarter, more serious.
* Many Search Engine Optimization experts stress the importance of using ".com". Some believe there is no other option.
Experiments have been made when a few websites were created with exactly same name, content, etc. - one had the ".com"
extension and the other ones ".biz", ".tv", ".net", etc. Apparently the ".com" site ranked higher in Google than the rest of them. Google also takes men wearing a tie more seriously.
* When making a domain name purchase, if you choose one with a TLD different than ".com", there is a great chance that you will
lose some or many prospects. Many people might remember your domain name but as they enter it into their search engine they will subconsciously put
".com" at the end.You might not lose them forever but your competitor who has registered the same name as yours but with the ".com" at the end will get new customers. Whenever you have a chance to use ".com" don't even consider any other options (except, of course, when you are registering secondary domains).
The following articles have additional points:
www(dot)howtogeek(dot)com/126670/the-difference-between-.com-.net-.org-and-why-were-about-to-see-many-more-top-level-domains/
www(dot)ozzu(dot)com/hosting-forum/which-better-com-net-t24576.html
domainate(dot)wordpress(dot)com/2011/10/07/why-you-should-stick-with-com-for-your-business-domain/