i know these threads show up every week, but... (which faction to pick?)

[Tristrem]

Ok, here is the deal, I'm starting to get really far into my roman campaign (220's), and want a break frrom the heavy infantry slugfests, so i want to start a side campaign as an eastern faction to get a small taste of steppe warfare every now and then. I want to roleplay taking over the entire steppe region using all cav armies, and foot archer garissions, but i am not sure what faction is best suited for this. I really don't see the parthians, or the Hay doing it, so my choices are between the Saka, and the Sarmations. Which one is better suited to conquer the entire steppe portion of the map, including the fact of the possible reforms fo r the Saka?