The honest difference
Acrobat is a professional instrument: true in-document editing, redaction, print production, enterprise e-sign. People who need those features know who they are, and for them the subscription is justified. The problem is everyone else paying the same $180 or more per year to compress attachments, convert the occasional contract and sign two documents a month.
DocFather covers that everyday layer for free, and prices the expensive part, AI document understanding, per use instead of per month. The result is not an Acrobat replacement for a print bureau; it is the right-sized tool for the tasks that fill most people's actual PDF day: convert, compress, sign, ask, and keep.