Later Seleucid (post-166BC)
The army with infinite possibilities. This army boasts, both superior and average cataphratcs, elite lancers, superior and average pikes, superior heavy foot impact swordsmen+, armoured and protected offensive spear MF... all of which are drilled

Supporting this there are many fast moving mounted options; superior armoured cavalry, average swordsmen-bow cavalry, light horse (bow and javelin), elephants, camelry and scythed chariots. In addition there are plenty of supporting foot; Heavy impact foot swordsmen in both superior and average varieties, MF with heavy weapon, light spear and offensive spear (drilled, but poor). To provide ranged attack you have everything from the ubiquitous superior cretan archers, to archers which are MF or LF, average or poor plus average or poor slingers. To top it all you can have heavy artillery with bolt shooters, massed levies to boost BPs, and a fortified camp!
So with these options you can create a quality army with few weaknesses or go for quantity too. The mounted option can be game winning in itself and the pikes are always a problem for ancient armies... the 2 in combination can be devastating! What more could one ask for?
Well, plenty more.... there are the allies to consider.
Elymain Allies bring more superior cataphracts plus light horse archers and a choice of MF or LF bow. This gives the possibility to create a strong cavalry dominated army which can be great on wide open maps.
Jewish Allies bring 2 options for LF, plus more pikes (4 more, just in case the 15 you can field already aren't enough

) plus up to 9 more MF offensive spear and more archers (LF and MF) and slingers.
Parthian Rebels bring even more superior cataphracts plus lots of LH archers.
So with ally support you can field 10 superior cataphracts, with plenty of other mounted options and missile a plenty for the perfect hit and run army, or simply field 15 pikes, 4 HF and 9 MF for an army that can stretch across the width of many battlefields to reduce movement options for the cavalry armies.
Awesome
Weaknesses:
Very few, the most obvious being not enough points to pick all the desired combinations! Probably the only two real weakness in a battle are;
- The ability to field a really good army to strongly compete in a battleground dominated by disordering terrain. However, having said that, a moderately good army can be fielded by using the Jewish Allies.
- Survival of the pikes verses a good Roman army that has lots of impact foot. Although if the impact phase is survived then the Roman army is toast.
Finally, the possibility of anarchy from the cataphracts and lancers can also result in good, relatively expensive, troops being wasted, although with a supporting commander this can be minimised and when it happens the opponents never escape without losses too!