I know that there is dedicated software for book publishing, such as Affinity Publisher, Adobe Indesign, and so on, but I have used for a certain project LaTeX, which would produce a PDF.
Since most of the typography is taken care of in LaTeX, I am interested in possibly doing some finishing touches in a PDF editor. These touches could be simple removal or simple additions of elements, and at least and necessarily conversion of the PDF to PDF/X-1a:2001 or PDF/X-3:2002. (They could also include greater acts, if I'd fancy it, such as realigning page margins.)
I don't use Adobe (nor they me), and I will need a PDF editor.
So, in this case, if one does not use Adobe software, needs the said conversion (or export), and wants to do some light (or heavier) PDF editing, is it good and a safe choice to go for a dedicated professional non-Adobe PDF editor?
Extra information or subquestions possibly relevant or important:
Of course I would want the resulting end PDF/X to comply to the standard properly, and I am also interested in knowing about the resulting visual quality. If a well-known trusted company existing and serving for a long time states they have PDF/X compliance, then chances are this is true. But should one use it for book publishing and PDF conversion at all?
Should I just import my PDF in Affinity Publisher, do my edits there, and then use a dedicated professional PDF editor to convert to PDF/X-1a:2001 or PDF/X3:2002 (as Aff. Publisher doesn't have these two options (and I even read that their PDF/X conversion wasn't that good, though I don't know that last one for sure))?