I definitely say ALX.exe is the better of the three. Certainly better than RTW. Things you can notice are that the AI actually retrains their units. Their missile troops actually aim at things that they can kill rather than judge on distance like in the regular RTW.exe.

I've noticed diplomacy is better in ALX.exe. They also combine the smaller stacks. They never try to attack you with those 2-3 unit stacks. It's always something big. Factions are also not aggressive as hell for no reason. I've seen the AI use navies to transport troops sometimes, but not very often though.

They also like to flank your troops on the battle map, a lot. They also like to go around the back of your formation with their cavalry. They usually try to not hit the center of my line but rather the sides.