"more applause"...
As a career musician, it's appalling anyone would suggest it's OK to download something for free when these guys are BUSTING there humps trying to make a living doing this. It's always been tough enough as an artist to make a living doing what we do, and the advent of the internet had been both a blessing and a curse at the same time. We, as artists (be it musician, magician, what-have-you), have a great platform for getting our material into MANY more peoples hands than previously thought possible, but unfortunately that comes at the price of more people being able to attain it for free. (or STEALING). Don't want to rant too much off topic, so...
ON topic, I have all 3 volumes of the DGP, and love 'em all. BUT, I haven't seen Dangerous, so I can't comment on "which is better". In the end I would end up with 'em both. But that's me... At the moment I have MORE than enough magic to PROBABLY last me a lifetime, as I tend to go on "buying sprees" and end up with more than I can digest.. (Just the three volumes of AOA is enough to keep ANYONE busy for a LONG time!...).
Good luck with whatever you choose! It sounds like either way you can't go wrong!