With STF around these days, you can just use the feature to test one of those, while using the other on your main, or an alt.
Go ahead, play a full gen of each, then decide.
About the other questions:
Well, nowadays a headshotter-build is going to give you the most benefit, but 2slot bows might be just as good, depends on you really.
On the PD question, I'm no archer, but that 10PD will make you very, very inaccurate. That much I know.
Accuracy won't max for you now, but I'd say anything from 140-to 150-60 will do the job, provided you can actually aim.
Yeah, crossbowmen are mostly hybrids, wearing an arbalest makes a 15/24 build doable.
Also, inb4 some experienced ranged dude giving you more accurate details.