Which faction is best when encountering mongols

[Alexander: The hellenic empire]

Using vardariotes is not effective. Yes they are the best, but are expensive and the mongols are to many. If you want to fight single combat they are perfect but for the war out attrition they are not.

I believe Vardariotai are not so expensive, if compared to other cavalry units.

Recruitment Cost: 800
Upkeep: 250