Way back in the day, I was always waffling between Soma Prime and Latron Prime. I'd say crit just because of the high multiplier, but I've honestly not tried to build for status on it. The big problem I had with it in long void missions was ammo, it gobbles it up and I was never going to waste a mod slot on ammo mutation, so I was dropping lots of packs.
Soma Prime does shine if you are running four Corrosive Projections and can just build for slash and viral. It can melt nullifier bubbles too, although I usually brought my marelok for the healing proc and had that built to pop bubbles.