If you prioritize high quality graphics, use Print > PDF > Save to PDF or Share > Export > PDF (Best). These two methods seem virtually identical. Graphics included in the document keep the original quality and resolution.
There is no difference between any of the methods for text and inserted shapes. They are vector graphics and keep their infinite resolution.
If you will send the PDF off for professional printing you can try one of two options.
- Print to PDF/X. This is supposed to produce a file with colour profiles that a printer can handle correctly. See further information.
- Print to PostScript and then convert the postscript file to PDF - preferably using Adobe Acrobat. In some (or all?) cases this produces a file that is easier to colour separate. See further information.
For information about some of the features that Pages supports in PDF files, see this post.

On the left a 300% view of a picture scaled to fit one square inch in Pages. In the middle, the same Pages file exported as "Good" PDF. The loss of quality is clearly visible at 300% magnification. To the right is the result of a "Preflight" in Adobe Acrobat. The image dimensions are 73/73 pixels.
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