Made a spreadsheet of enemy types & their enhanced drops, as well the dungeons by enemy types.
This is should help you pick which dungeons to run for the gear you want since some aspects are more common on certain armor types.
Maybe someone else will find it useful.
I tried it earlier on my sorc. Went after ghosts for wands, and I did notice more wants dropped than when I do dungeons that don’t have as many ghosts.
So no data, just anecdotal.
Anecdotes can be useful.