hard to say who was greatest. take away radar and lets see who was the best, that means a majority of the listed would not feature i think.
alb- OF LOE an thier 8 fg zerg (when half of albion was in LOE)
mid- maelstrom
hib- hmmm none of the pryd guilds stood out as they disbanded every other week
Erm how about no? Eclipse, Tuatha Dè Dannan, Severance and us been there since almost forever.
Speaking from Prydwen pov:
Alb PE and FL
Mid MM and Maelstrom
Hib Eclipse and Nfd ofc xD
Severance as well, and NP dipped their toes in hib for a while.