[Lolidir]

Now that you point this out. The first thing that comes to my mind is that the uruk-hai that fought at Helm's Deep were from Saruman, and the ones from Gondor were mostly if not entirely from Mordor, made by Sauron (undoubtedly the more evil of the two). So in that respect the races of uruk-hai were different. Like that of the world today. The way they were made, or brought about and what was put into them. Bigger and stronger, meaner - possibly but the book doesnt really say.

Now as for which army was stronger and what not, I think is a bit of an unfair statement to make. You had the Rohirrim who all had horses, basically, and from there they had the long spears and it is much harder to kill a man on a horse with a spear than a man with a sword right in front of you.

As for fighting in dire need. In Rohan they had Aragorn, and he sparked that light of hope, if you can recall in the movie when they are in the armory and Aragorn and Legolas have the "heated discussion" and in which Legolas see that a false hope is better than no hope. Even Theoden recognizes that he didnt lead Rohan to victory but it was Aragorn. In Gondor there was Gandalf, but he was no Aragorn. The people had lived to long in fear and no one to lead them. At least in Rohan there was Eomer. The people in Gondor looked out the window and saw the vast number of uruk-hai and other enemies and lost all hope. No matter what you say Gandalf was no king, he was no Aragorn. Even if he did Gondor still didnt have Denethor behind it, and too have someone come in and try to do good without the help of the ruler just doesnt work as well as if you have both working for good as Aragor and Theoden did.