noctowl > corviknight, and here's why:
with Substitute and Calm Mind, noctowl can easily set up on defensive heatran, non-unaware clefable, blissey, slowbro, slowking, and a few others. Sharp Beak is used over Heavy-Duty Boots to guarantee a 2HKO on Blissey at +6
have fun!
https://pokepast.es/51c69929b45f81c1