Wow. Playing DnD CRPG's and not understanding Thac0, etc. Wow.
Asking which bow or xbow is a thoroughly fair question.
On the simplest level, the higher the damage and/or Thac0 (i.e. to hit) bonus, the better. That said, there are often other secondary benefits that weapons will have that may be of more value than the simple raw attack and damage bonuses.
For example, Sseth's Bow has +1 attack per round, which is a nice benefit for what is otherwise a fairly low level weapon. And it has a very good speed rating, which allows it to get in the first shot before meny other weapons or spellcastings. Which, in turn, makes it good for trying to disrupt enemy spellcasters. A slower, but harder hitting ranged weapon may not be as preferable as a quick-firing weapon, if your goal is spellcasting disrupting.
I am not fully familiar with all of your listed bows from memory, but they're all probably good bows/xbows.
Something else to consider is that I wouldn't mix and match bows and xbows. Obviously, they use different ammo and carrying around both types just uses up more inventory slots. Pick one type and just stick with it.
Personally, I prefer Bows over Xbows, but both have their uses and in a full party, I'll have both. But for a solo, I'd just pick one.
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