I think that the main thing is the multiplayer available to all players (who plays your game).
If it is a server of a steam - it's ok, if it's a player's server (like the old school) is also good... I think, maybe the second option is better..?
The most important thing is that so that all user scripts has worked in the multiplayer map.
I hope, after working on DX11, we will vote for real multiplayer (up to 16 players or even more) - it will give a huge plus for GameGuru, imho, and for my project too
. I want to wait and hope.