I would say shout mostly because my personal experience . this was the most gamechanger that happened . I also have wall but when I became a happy shout owner my RW options opened a wide new world . I could RW a pure dps when convenient , a medica blink , crit up , another atk raiser like Apoc shield . I think OK bsb fits well in the long term run . It gives more party composition teams . By your question I suppose you have a physical team preference , because shout is a no brainer for physical meta . If you into that OK bsb will need another atk raise to bring the dps you need . You also said you already have other relics for III synergy so I would stop pulling for now RS is really important in the long run . Good luck