I'll be maining a Zero, so I can't get the full four piece RA set bonus. I'm not sure which of these setups would be better.
2 AV Pendant + Ring/Earring/Helm
The first set of equips would have the three set RA bonus (which is like +50 ATT), the three set AV bonus (+50 ATT), and a Dom (which will be like 20 ATT higher than my second AV Pendant). The second set would lose out on about 70 ATT from the RA set and the Dom, but I'd gain 30% Boss from the five piece Alien set. The AV Helm also has four more slots than the RA one.