Assuming you'll use proxima for corvus synergy, bring proxima to r3 so that at least she'll survive a few hits if you have to use her as a last resort.
Definitely Proxima. Long-term she's great for long fights with her Special Damage boosts but even short-term she can get True Strike up frequently from stages of her missions.
Plus she has some amazing synergies, particularly with Corvus Glaive and Nebula
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Plus she has some amazing synergies, particularly with Corvus Glaive and Nebula