>>535268856
generally speaking, high CV. ideally high CV with base rolls in subs desired by the set wielder(s). when you're first farming a set you can't be picky and should focus on getting a variety of pieces to complete multiple 4pc sets. but as you continue farming you will want to focus on high cv and pieces that balance your high cv pieces (high RV pieces that are not necessarily high CV but have useful subs that make up for the loss of CV).