Yeah I just recently did an in-depth review of Retribution simulation and rotations, and updated our gear rankings. I’m finding that there are a lot of legendary combinations that are very close to each other for retribution at high gear levels:
ashes to dust + chain
whisper + chain
liadrin’s + chain
Those tend to come out the best. But you can also do combos without the chain, depending on other available gear, and they aren’t that far off.
edit: that’s single-target of course. Sometimes other legendaries come out on top for AoE situations.
Here’s that article if you’re into the nitty-gritty of simulation: Retribution Simulations, 7.2.5