[qwerty1234]

Which weapon is best to use as ANTAG/RAIDER for this character? It seems like every of her weapons is very situational, how do I suppose to make damage with a DEFAULT crossbow for example? This weapon is completely useless in open areas or against bosses (Kuzman, Spheres, Tentacles and so on).

[Skyline]

You alrdy answer this question.
She not have all around weapon for every map.So only your skill can sharpen this situation.
All her weapons is very usable and all her weapon is very weak in same or different moments.
Play,evolve ,learn (c)
Any answer with the name of weapon will be not correct, it is possible only preferences.

[Level9Drow]

I use Javelin and card for initial speed boost in cat form for 4 seconds and the bonus damage at 100% health. This way I can always get distance to shoot the Javelin fast enough and heal up far away and then drop bombs from across the map.