My favorite unit type would probably be Infantry - primarily since it is what I use most in many campaigns. Their main purpose is to hold the line in place while other units can nip round their flanks. I also use cavalry units and some missile cavalry units as flankers and archer killers (should they be harassing my infantry lines). Archers also sometimes come into play, although I do generally not use them as much as other unit types due to their poor performance once their arrows have run out.
Parthia isn't a hard faction to play as, although I usually follow the same strategy as totalwar092 - blitzing the Selcucids with the faction's starting units as rapidly as possible to gain some cities which can provide a worthwhile income. Sadly the infantry based AI doesn't really know how to deal with horse archers, so are a bit of a push over when they are used.
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