My advice is theoretical, 'cuz Atropos is mainly Int, with a little Dex for improved to-hit & DPS. So take it with a grain of salt....

Don't just consider the weapons. Also consider the armour. My bear (Epimetheus) is much more survivable than my chicken (Aereus), and a lot of that comes from his armour. Warrior armour is a lot more protective than archer armour. It keeps you alive longer, especially when being swarmed by a whole mess o' mobs. I have noticed that Atropos tends to get swarmed a lot -- usually for daring to cast a Heal spell or my AoE nukes -- which usually leads to her death.

If I was going to re-spec Atropos, I'd go for Str so she could wear warrior armour. That way, maybe she'd survive a little more while she's tossing out the Heals and AoE carnage....