It's all situational, i personally use:
Soloing:
Atma of the Lion
Atma of Sea Daughter
Atma of the Sundering Slash
Party:
Atma of the Lion
Atma of Voracious Violet
Atma of the Sundering Slash
NM:
Atma of Stout Arm
Atma of Voracious Violet
Atma of the Harvester
This are the set ups that works for me, but im sure, many DRG use different combinations, depending on activities doing. Hope this can help you ^^