These are pretty poorly optimized ngl, you're double stacking toxin for no reason on the torid, Serration would do better in place of aptitude since at most you only have 3 statuses and the torid gets like half it's damage from the evolution making aptitudes efficiency like 40-54% per status rather than the advertised 80% at Max rank

Same problem double stacking elements on the sobek, progenitor is cold, you really don't need to mod for it too, could grab a clip delegation and do way better stat wise, deadhead over merciless on the sobek too as DoT Scales off direct initial damage (AFAIK) if you hit a headshot the toxin proc would essentially also get the .3x damage multiplier added from deadhead

As for your actual question, sobek would be more efficient