definitely rb2. rb is supported by the best team of developers that release DLC content EVERY WEEK, at LEAST three songs, many times more. you have to realize that you're not just getting the 80+ songs that come with the disc, but also online access to almost 350+ more songs in addition to it, including a fair number of whole albums. in the long run, it's the better investment. you can see the list of downloadable songs here:
http://en.wikipedia.org/wiki/Downloadable_content_in_Rock_Band
also, if you're concerned about the family aspect of this, RB2 has a better selection. they've branched out into children's songs (jonas brothers, spongebob squarepants), country (toby keith), and funk (james brown, earth wind and fire), so it's more appealing to everyone generally.
the only reason i can see to go for GH:Metallica is that you are the world's #1 metallica fan, or you are an expert drummer who just has to have that double kick pedal (though a simple splitter can actually turn RB2 into a double bass if you want).
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