Page break is natural. However, the Continuous View mode offers better user experience in scrolling between pages and PDF pages are loaded 3x faster in this mode.
Here is a comparison,
PDF Reader shows a page break after Page 5 on the bottom of the PDF Reader window while scrolling down with mouse wheel.
PDF Reader Pro shows Page 5 and Page 6 continuously without a noticeable page break.
However, the page margin remains the same.