The Great Stag Knights have identity problems.

[Draken]

I just started a new Wood Elf campaign.
First battle, setting up my units.
Hear a shout: "Wild Riders!"
Wait a moment. I don't have any Wild Riders? It was the Great Stag Knights that pretend they are Wild Riders by shouting it very loudly.

[A.Pot]

You can see the unit models for them are Wild Riders. Its the same how Empire War Wagons have Outriders mounted on them and will call themselves Outriders.

[Mr. Ape]

Yea, this is the first thing I noticed while playing. Kinda cheap for them to use the same voice lines. Hope they change it in the future.

[Ghuldarkar]

I mean they are part of the wild riders, just a different division riding great stags instead of the smaller ones.