I think the best method is to anticipate what your opponent might have, and how you plan on countering them.
So for example:- What if the enemy has an Elephant? (bring a Psiloi along, just in case). What if the enemy uses a City/Fort? (bring the Artillery along, just in case). What if the enemy has War Wagons? (again, bring Artillery, which also kills Elephants) What if the enemy has Knights? (bring the Light Horse along to make ‘Pursuit Traps’). What if you need to occupy bad going? (at last those useless Ax have a role to play!).
Seems like the III/13b Later Avars have everything to suit your needs.
Stevie's logic works very well here and I would seek to add to it...the (b) list is allowed II/69c (Sassanid) allies allowing various options but the most workable is 2x3Cav(including Gen) and 1xEl. which you can use to replace whatever 3 elements you want too from the Avar b list? The Elly could add a bit more clout to the army?
You could even use the Elly on Martins Fort.... Shot in by Artillery. 😁
Yessss! Take that Martin!!! How do ya like them apples?!!!
It’s a plan..... but isn’t the El restricted to attacking only the gate of the fort/city (a vague recollection of the rules) and is also destroyed if beaten while doing so....? (See previous comment in parentheses...).
Anywayzup....looks like a more balanced army, if a bit PIP heavy, with ally and El. Would be well worth running at a tournament.