SAM Atma

I know there are some threads out there that suggest atma, but they are very vague from what i am finding, if any SAM could guide me in the right direction, id like to know what are the three optimal atma to use, currently i just use RR VV and Apoc....should i be substituting RR out for Harvester or SB perhaps? And i will be trying to get Fudo eventually, do my atmas change when i acquire this WS. Thx in advance for ure help.