Polybian Units vs Camillan Units

[Aemilius Paulus]

If you form your army properly, you shouldn't have to use the Triarii at all.

"If"s are irrelevant. One can win a battle with only horse archers, but does that mean they want to use only horse archers?

As for the best units? Pedites Extrodinari. Keep them back and then charge them when you need to a decisive blow and watch the rout begin. PedEx FTW

Agreed. They are my favourite as well. Triarii work the best as line holders and anti-cavalry units. PEs work best against heavily armoured infantry and cavalry units, as well as making superb flankers. Although I would recommend Hastati or Principes as flankers.