Originally Posted by
Hummingbird
Keep in mind that Gondor Militia and Cavalry Militia still requires a Town Guard and Stables whilst Rohan Eorling Militia and Scouts can be trained straight out of the farms, no military buildings required. So Gondor's "militia" units are effectively one tier above Rohan's. Gondor Militia vs Eorling Swordsmen and Gondor Cavalry Militia vs Rohan Riders is a fairer comparison.
Also Rohan's cavalry roster is a heck of a lot more than 'slightly' better than Gondor's. Put the two alongside each other and it really is no contest, Rohan blow them away in the cavalry department in every single way.