Taco,
My last build, I had both on hand. You can drop your equipment at your feet and pick up the ammo you want for the target you are going for. I'd keep the Tatar equipped and if a plate crutcher came by, drop your equipment and switch to bodkins. Having the above mentioned ability to just pick your ammo type would be nicer, though.
I also went with a horn bow. It is the strongest 1 slot bow, so I could have a 1h weapon on hand in addition to two quivers. Also, I only went up to 5 PD because PD decreases wpf and accuracy. I preferred accuracy. You get less kills if you don't headshot, but as an archer, you should focus on weakening the enemy so that infantry can finish them off quicker.