Even the plus versions of 4 stars are worse than the story armor, having a lack of defence or attack, based on the armor. A big four + will have stats on 750/750, or something very near. A plus two star, will have something like 550/750 or vice versa, ecept the flowstone battlegear, wich the non plus version is likely the same of crius +, only a bit worse, and the plus version being very high in defence and attack( i remember something like 800/900...)
So dont bother getting those.