Sometimes users ( even admins) log out automatically and needs to log in again. In admin case when they click from admin panel to site link they are again logged in but after browsing some forums they again log out.
I would have just suggested to see what google has and pick that one but if I put in gtroad.net into the search - you're not even on page one. Now I see why - you're still new. So, I would pick the non www version, shorter.