Which AP ranged unit?

[Mithrandir]

I personally prefer a bit of both, 2 xbows just for the ammo, and 2 longbows...or more :) for the damage and flanking once out of ammo...

[katar]

i usually go with 4 longbows, having them all concentrate on a single target at the same time can rapidly anihilate the most threatening enemy unit before they get to you.

[_Aetius_]

Longbowmen fire over the line, Arbs will hit your own men, so unless you can redeploy them on the flank, which tends to be difficult, then they only have a short time to hit the enemies best units.

I use archers to shower the enemy infantry with arrows and use a couple of arbs to hit the enemy heavy cavalry, what I also like about Longbowmen is that they are passable light infantry that can do a fair bit of damage in melee. I think they work best in conjunction with each other.

[Vladimir]

I just use my longbow men to take out the general and their decent melee attack to hit their flanks.

[Philippus Flavius Homovallumus]

I personnally use Longbows, the arbs have a lower rate of fire, the same range and, as said, they shoot in a straight line.

[antisocialmunky]

Arbs are longer ranged.

[Philippus Flavius Homovallumus]

Not true, unless you mod it, default is 6000 for both (120m). I know because I always turn 'bows up to 10000 (200m) and arbs to 12000 (220m). Arbs are more accurate though, so you get more kills per volley at range.