For a researcher or practitioner to consider a Bengali Tantra PDF "better" or authoritative, it should possess the following traits:

Once you download a candidate file, verify its quality immediately using the "3 Second Rule":

Universities in West Bengal (like Calcutta University) and Bangladesh (Dhaka University) have digitized rare manuscripts. Search their e-repository for "Tantra Grantha." These are academic-grade scans, meaning they are far superior in quality to consumer scans.