Durango vs PS4
Steam itself has 3 networks. Valve had a pretty unsecure FTP up until the hack, no complexity to passwords at all, which meant you could basically grab all the unreleased games sent to Valve for the Steam network. It was clean, but they have been working on various EP3s.
There isn't an 'offline' network, basically connect to VPN and go crazy. A decent internal wiki details the network and their games, corp, etc.
More info on durango
Sony PS4, I say this out of their power. Keeping in mind Sony isn't the best for security, hopefully they learnt from currentgen, that would really make Sony a winner (except with some exclusives, works both ways). I useto support Durango as I genuinely believed in Microsoft, and probably shouldn't, they have some serious security issues coming their way if they don't change. So really, my money is on Sony.