Hello Effiong,
If you're asking about the real PMP exam, it's not an "either or" situation. Although there is an important caveat.
You can always skip questions to be revisited later, whether you use the breaks or not. However, do remember that the exam questions are split up into three 60-question sections. Candidates are thus forced to seal off the first 60 questions before embarking on question number 61. In this way, you can only revisit the 60 questions in the section that you are currently working on. So, it's not like you have the possibility to finish off question number 180 and then go back and look at number 50 again, for example.
Do also bear in mind that not using the breaks provides zero extra time to answer questions. You simply finish the whole exam earlier than other people who started at the same time as you. In that context, I don't see any advantage to not making full use of the breaks.