I like both, as noted in my reviews. For what it is worth, I was never the huge fan of the
3e version, I prefered the grey box. I found the
4e FR campaign guide to be an excellent framework for your game/campaign. A framework, this is important. It means you have to build your own stuff, aside from the adventures, at least if you want details en masse.
Now, if you are looking for a book that tells you what the price of roasted dragon steak is in an Inn in Waterdeep, this is definitely not the book you are looking for.
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360 hours played
Gnoguh, human fighter/cleric (kensei->adamantine soldier)
Carric, elf cleric/ranger (radiant servant->saint)
Torn, tiefling wizard/cleric (divine oracle->sages of ages)
Truxas, human feylock/bard (feytouched->feyliege)
Tagron, human rogue (daggermaster->deadly trickster)
22nd level Musings of an Epic Virgin 
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