I have not used either product but I have researched the Liquid Roof product. There are several reports of users being happy with it. It restores an EPDM roof, greatly extends its life, and virtually stops chalking. Another product from the same company, Liquid Rubber, is much less expensive and has worked well. I have a nine year old EPDM roof and expect to use Liquid Roof or Liquid Rubber.
2014 Palazzo 33.2
Cummins 6.7 ISB, Allison 2100 6 Speed