The Rossi octagon barrels could possibly prove superior over time in holding their accuracy. The octagon models dispense with the “barrel bands” as attachment for the forearm, magazine tube and sights. These bands can loosen with time and hard use, introducing slop and potential inaccuracy. I prefer the 20” octagon “short rifle” as Rossi uses a rather heavy untapered octagon barrel, which makes the 24” full rifle rather tiresome in a long offhand session.
Soft points? I would imagine that you are referring to the gummy point Hornadys, which I see pretty much as a gimmick with no proven real world benefit within the range limitations of the pistol caliber carbine and its sights. Their 140gr bullet is also a point against them in the velocity-challenged carbine. Even with its “point”, the gummy round is only a decimal point or two more aerodynamic than a rock. With both limited aerodymics and velocity, the only effective way to increase lethality is to increase bullet mass and that means stepping up to the 158gr and 180gr rounds, which, I think you will find to be better performers overall.
Best of luck and remember, its always better to have too many rifles and pistols than too few.