PDF to JPG and PDF to Word both extract content out of a PDF, but the output is fundamentally different. JPG gives you rendered pixels of each page. Word gives you the raw text stream you can edit.
If the goal is to embed pages in a slide deck, share a preview on social media, or annotate visually, you want JPG. If the goal is to change the copy, fix a typo, or reuse content in a new document, you want Word.
For scanned PDFs (image-only), PDF to Word will produce empty output unless you run PDF OCR first.