Well,

you have to be wary of Fozzer - sometimes he drinks
too much and it can affect his mind....

FS 2004 is better in every respect but you will need a GOOD computer. Post your computer specs here before buying it.
Ben
Hi Ben...!
Tee-Hee...!
I agree, that anyone who is considering a first-time buy of the Flight sim, then FS 2004 may be the way to go, but for someone ike myself who has stepped up, one by one, from the earlier versions, noted that the biggest improvement was from FS 2000 to FS 2002, and invested so much time and money in up-grading FS 2002 to the point that it is now superior to FS 2004 then that's the reason why I prefer my FS 2002...!
For example: FS Navigator and LAGO's FSSE programs are better on FS 2002, than FS 2004.
Also the add-on weather programs which bring FS 2002 up to FS 2004 standards, without the frame-rate hit...!
...not forgetting the various add-on water effects, road effects, scenery effects, scenery objects, etc, etc,...
Most available free from SimV, etc...

...!
Now you can see why I love my FS 2002...

...!
...and my FS 2004 disk is covered in beer stains...

...!
Cheers mate...!
Paul.
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.