It depends on how your going about marketing yourself. It will have no effect on organic SEO, however if you are marketing via TV or radio where people have to remember and then go to the computer and type it yes most people will falsely remember .com and not .net. The tradeoffs could be minimal. If your brand relies heavily on branding go for the .com. If its all SEO and people clicking links and not having to type the domain in themselves you can go with .net.