Espcially for things like GM mode I highly suggest the PC version no matter if the console version gets GM mode or not. The controls can be very complex and not having keyboard and mouse would make it very hard to use the full potential. Ontop of that modding and custom campaigns/maps are plenty on PC on sites like moddb or nexus - you won't have access to that much variety on console.
For just playing the game the console version should be fine, but for GM mode you should go for the PC version. It's not like a selfbuilt PC is expensive. A decent one which plays D:OS 2 on highest settings is like 300-400 euros + a monitor, keyboard and mouse.