Qualtrics - Blocks vs page breaks
Why do I use blocks rather than page breaks?
Blocks vs page breaks
Blocks work better for me than page breaks. When you need to have skips and toss individuals out of the survey, or use more advanced settings or organize the questions, employing blocks is easier to work with.
Because the submit button must be placed where there are no page breaks or you will get submit for each page of the survey, blocks are easier to construct page buttons.