Unlike my Emerald Nightmare Balance Druid Spreadsheet, I did not make these two google docs. However, they are great baseline comparison tools for Balance Druid gear from the Nighthold:
Both were sticky posts in the Druid Discord channel. Check out your class and spec at the Useful Discord Channel List I compiled. More and more, the class Discord channels are becoming the go-to place for up-to-the-minute information about your class.
Sensibly, Aran’s Relaxing Ruby has been nerfed. It is still okay-ish for AOE, but it is no longer the best single target trinket (combined with the Nightbane chest) as it was when I simmed a few weeks ago.
On top for single target are Whispers in the Dark and Erratic Metronome. I did not score the Metronome when we went 7/10H in the first night of Nighthold, but my Unstable Arcanocrystal and 880 Ethereal Urn are about as good as you can get outside those two.