Yellow deeds + faction:
Whitehelm / Hall of Guardians, Pan’s Vale / The Warrens, Divinion Fields / Wild Court
Yellow deeds + faction + gives attack at level 15:
Suncrest / Stonesong Eyrie
Depends on whether you intend to tackle any of the faction-vs-faction clears, in which case level that one first. Otherwise I’d say Suncrest, holding off on doing that myself though since I’m not 100% sure. No known forthcoming factions are in kingdoms using yellow deeds.
I have a handy reference for just this sort of question:
https://docs.google.com/spreadsheets/d/1_S3olGg6_DBcX5EwOQ8bAYtkYzGvrnGWCSRZoc9AFlU/edit#gid=0