Tried a Multiplayer flight tonight with my Mate; Greg, (Longbow Jet), he on FS 2004 and me on FSX with FS Tramp (Radar).
Not a very good mix!
(The Flight Sims!...not me and my Mate Greg!)....
Our scenery is different, obviously, and FSX has all sorts of annoying problems when using the Chat Window for communication using "FS Host Client" for connection.
"FS Tramp" Radar works well with FSX and I can spot Greg during our flights!
But FS 2004 (with FS Navigator Radar) runs much more smoothly and trouble-free, (direct connection from within the Sim), and is better suited to Multiplayer, (using FS Host).....I reckon!
So...for my off-line Solo flights, its FSX and FS Tramp for the FAB scenery, and for my on-line Multiplayer excursions, its FS 2004 and FS Navigator..also with some pretty nice scenery!
Best of both Worlds?
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.