Drow after the Salvatore experiment got sooo much Exposure. They had a Drows of the Underdark supplement, Comics etc. To be honest, If they were a Movie Star I would say they were overexposed. Other Authors jumped on the Drow Train. Duergar like Dwarves really became the B demihuman of the REalms. People wanted to play Elves with Wings, Wood Elves, Elves from Evermeet and of course Drow.
Demihumans of the Realms has a bit on them, and the go to guide on Dwarves, Dwarves Deep has but a paragraph on the Gray Dwarves (I learned this to my error after buying it).
The issue being here is that for the Drow we have a wealth of older product to build stories and characters around them even if they arnt too current, and while there is a wealth of FR past lore on Dwarves ( still nowhere near the same as on the Elves in general) it barely touches on the Gray DWarves at all.
Finding currently sourcebook lore on the Elves/Dwarves is well .. non existant.