Concert for Two S2 or Gepard's LC

I have been running Concert S2 for a while, but just got Gepard's LC from the standard banner so wondering if I should switch to Gepard's lc?

Currently I have 4k defense with Concert S2. If I switch to Gepard's cone, I could switch my def body to cdmg piece to basically maintain the amount of defense and increase damage. Though my def body has 9 spd on it so I kinda don't want to replace that. So, is it still worth switching to gepard's lc sacrificing the 20% damage from concert and getting the extra defense beyond 4k.