bonuses, technologies and a focus on a set of unit upgrades to make them even stronger. As one race may excel in Cavalry units, the other race may not have a population limit— meaning you don't have to build any houses
Aztecs would generally be remade. The latest patch is v2.2 which was released on May 10, 2013. A detailed explanation of the mechanics behind this: To OP, if you are talking about arabia, which I'll assume you are, aztecs are probably better. Tech Tree lies and secrets (now w/ full ...