They're pretty terrible compared to their last-gen predecessors. Gen-1 HCs had powerhouses like Devil You Know and Lord High Fixer. Gen-2 HCs are like pitiful, mewling little shit-pistols in comparison. I guess if you had to go with one, I'd say grind away New Monarchy until you can get a Red Hand IX or grind Dead Orbit until you get Venation III. Those two are the only last-gen revolvers that have the new max damage, outside of grinding Iron Banner in hopes of a Timur's Lash.