I recommend AGE.
It's available diretly in your AoE2DE folder, in "Tools_Build"
and allows you to check in detail every single unit, technology etc., where you can be 100% sure that the information is fully up to date.
To, for example, check hidden bonuses of cataphracts:
1. Set up your file settings like this:
2. Go to the "Units" tab, type the name of cataphract