Che Guevera - " A Revolutionary life".

[billy19murahmi]

hi,
i'm really confused about buying this book --> Che Guevera - " A Revolutionary life".

there are many editions,
1997 edition has 832 pages. Publisher =Grove Press, 1997
the same publisher has released 2010 edition with 672 pages, Publisher=Grove Press, 2010

Other publishers:
1.2010 edition , 640 pages, Publisher=Bantam, 2010
2. 2010 edition ,864 pages, Publisher=Black Swan, 2010.

I read about him in the internet and i was so inspired by che.
I want to know complete information about him.
which book is the best pick?

And i have an other doubt,
why are the no of pages decreased from 1997 edition to 2010 edition.
it's been published by same publisher.
Are the contents decreased?

Please help me chose the edition.

Thank you.