Yes I tried Scan Tailor advanced (but it's last year version now...) and I was disappointed: too complex for me, unstable... I am quite happy with the "
experimental" version from the Arch repository.
After it, I get quite good results with Tesseract OCR.
Some PDF though are beyond repair: (but it's exception)
https://gallica.bnf.fr/ark:/12148/bp...811.texteImage