It's not Christus Victor vs Penal Substitutionary Atonement, but rather PSA and CV together helping to give a fuller picture of the Atonement.

 The Penal Substitutionary Atonement [PSA] and Christus Victor [CV] are not competing theories of the Atonement; they are simply different aspects of it, two sides of the same coin.

PSA focuses, often exclusively, on the Crucifixion and death of Jesus taking the penalty for our sins, being punished as a substitution in place of us being punished.

CV focuses, often exclusively, on the victory that Christ achieved over the devil on our behalf as shown via His Resurrection.