Manhattan vs Powerscore for Grouping Logic games. Forum

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I've read a few comments on this forum and elsewhere that the Manhattan Logic Games Study guide had a better approach to Grouping games than the Powerscore Logic Games Bible.

I have powerscore and have been debating whether or not I should pick up the Manhattan book for grouping game help.

Could someone elaborate on the differences between the two approaches?

Thanks in advance.

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Since this topic is discussed here:

http://www.top-law-schools.com/forums/v ... 6&t=162722

This thread can die.