I am thinking about buying another computer and was just wondering which processor seems to work best with FS 2004, the AMD or the Pentium IV? I am currently using the latter, and just wondered if there was much of a difference between the two.

Quality ?  Hmmmm.  If there were any question as to AMD quality... They'd have been run out of business a long time ago. Simple fact:  Given a set dollar to spend.. you'll end up with more CPU buying AMD, than Intel..

I would recommend AMD because you get more for your money.  The quality of the processors are equal to Intels.  In games AMDs are by far the fastest, because of 3Dnow and 3Dnow extended, also their architecture is better. Hence the reason they can be at a lower clock speed and still beat a P4.  I was in Game a while ago and was reading sytem requirements for a few games, and noticed a few of them had taken into consideration for AMD and Intel processor rather than general.  The recommended requirements were, P4 2.4GHz or Athlon 1500+.  I can not remember which game it was but i will have another look to see if i can find it.

I found a game which is similar to what i was talking about, Commandos 3.  It says recommended Intel P4 2.0GHz or AMD equilivalent, the XP2000+ (which is 1.7GHz)