I've got both FS 2002 and FS 2004 installed on my hard drive, but FS 2002 is the program I prefer because of all the various add-ons I have installed to it over the years, scenery, nav aids, weather programs, scenery add-ons, water textures, tree types, etc, etc....as well as the classic FS 2000/FS 2002 aircraft...

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Surprisingly, I also prefer the lighter default autogen scenery textures and the default cloud textures in FS 2002...

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Having used FS '98, FS 2000, FS 2002 and FS 2004 I found the greatest improvement was between FS 2000 and FS 2002
I think FS 2002 to FS 2004 only really gave marginal improvements in certain areas...

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So, for me, FS 2002 takes pride of place...

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...and FS 2004 is sulking somewhere at the bottom of my hard drive...

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LOL...!
Cheers all...

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Paul.
P.S. I've also got CFS 2...but I'm not really into shooting things...

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LOL...!
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.