From experience, personally I liked a hybrid of 2h/Archery. It suited me very well on both siege and battle, as you could duel proficiently while popping arrows out quickly. Once again, I used a less agi build for an archer, but once you practice and get used to the melee, it works very well.
Here we go again, tossing out a build which worked for me:
Level 31
19/21
WPF(2h): 100
WPF(Archery): 142
IF: 5
PS: 6
PD: 6
WM: 7
Items:
Weapon:
Barbed Arrows x2
Tatar Bow
Langes Messer(2h mode)
Little bit of an explanation: barbed arrows, a cheap good way to get additional extra damage but a good amount of arrows. Tatar bow, pew those arrows accurately(with practice) and quickly at your foes. Langes, probably favorite. Feels like a shorter HBS but need to get used to the stab. the PS WM and PD are self explanatory, need them all to do damage in melee or archery.
The IF can be switched for ath(on preference), but I found that it was nice to have(light armor + if = survive 1 or two hits more than without any as well as surviving 1 1/2 xbow bolts). In melee you basically have to block a lot and be a wall(since you can't usually really run out of the way) and make use of the animations and speed of swing
If you ever get to level 33, you can flush out basically all those stats. 21/21(7 ps, 7 pd, 7 IF(or split of ath/if))