My choice would be ABC. CTOR now is a good idea. It is an all around good upgrade. I am only against the SV upgrade because of Craig's actions surrounding it.
Why is CTOR now a good idea? Why is it a good upgrade? What were or are Craig's actions surrounding SV? Can you link to examples?
Nchain supported CTOR until March, then decided they wanted something else without much technical explanation. I believe nchain/ CSW are intentionally seeking a split in BCH.