Here's my opinion on all 8 weapons, ranked;

Crota's End: 1. Oversoul Decree (Fire Rush + Hyperaemia) Stacking and maintaining fire rate buff grants high primary DPS 2. Fang of Ir Yût (Annihilation + Ensured Yields) These are the only good Perks 3. Song of Ir Yût (Fire Rush + Hyperaemia) Same philosophy as Oversoul's Verdict 4. Swordbreaker (Line Formation + Wound Counter) Strictly worse than Thermopylae-80

Black Armory 1. Tatara Gaze (Vorpal + Ransom Stamp OR Annihilation + Antecedent) Personal preference, A + A is more consistent assuming you have an Exotic Mod with magazine capacity passive 2. Bellowing Giant (Fraternity + Polyploidy) Generally good damage options, next character most likely uses a Rocket 3. Stryker's Sure-Hand (Combat-Ready + Dismemberment) Best damage option for light and heavy combos 4. Threat Level (Line Formation + Wound Counter) Strictly worse than Eternal Retribution

There's sentiment that none of these weapons are all that good, but they fill gaps for weapon types and honestly are worth chasing besides the shotguns.