Have still lot of attributes to pick up at Arkadia and the all new missions on Calypso do not have attributes seems to that Cyrene also has a lot of attributes.
Calypso!
It's been a while since I've been on Arkadia so it could be that my statement isn't true anymore. But I had the feeling that all cool (mission) mobs like Huon and Scoria were only to be found in high taxed areas on Ark. Where on Calypso I think you can find almost all mission mobs in non-taxed or low taxed areas as well.