I own a BCN3D Sigma dual extruder and I am relatively happy with Esun PVA as a support material.
I have also been printing with Scaffold by e3D, wich is a PVA modified, and performs better, but still have issues in terms of moisture and material adhesion.
What’s your experience with this and other brands? Have you test that materials? Ultimaker official PVA seems to work very well but is also quite expensive…