Google Ad mob Ad units

[Brotherdarryl]

I have an app that I have recently launched - my first one, so really exciting! The number of users is still low.
It has several pages, each with its own ad unit on it. I read that it was a good idea to have a different ad unit for each page, but when I look at the reports, it seems as if it may be better to lump all the impressions/clicks from all the pages into one ad unit. Perhaps I'm being too impatient while the user numbers are still low, but if someone has some advice about this, I would really appreciate it.
Ps. Having a different ad unit on each page is an easy way to see which pages are more popular.