How do you know when to do maps?

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From what I know, you can do maps in order to get books that let you prestige your equipment.
However as I found out there's a limit to this, after a while the final reward changes from a book to something else.
I discovered that after completing a few zones that when I created a new map and ran through that, the final reward was again a prestige.
So how can I know when the final reward will be a prestige item? How much of the world do I need to do before getting more?
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When would we use a map?
Answer: Generally, we use maps as a reference to show political boundaries, landforms, water bodies, and the positions of cities. Maps also help us to know the routes of an area, landmarks, location (latitudes and longitudes) of a building or things, etc.What do I need to know for map?
10 things you need to know about maps- 1Do all maps show real places?
- 2How are features selected?
- 3Why do maps have scale?
- 4Why do place names change over time?
- 5How are hills shown on a flat map?
- 6Why use symbols?
- 7Do maps go out of date?
- 8How do maps show human activity?
How do you use a map properly?
Here's a guide to get you started using Google MapsWhat are the 4 steps of reading a map?
How To Read A Map5 FANTASTIC Google Maps Features You Want To Know About
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Images: Brett Jordan, Max Vakhtbovych, Yan Krukov, Yan Krukov