WWow, CPA Empire hasn't called me since verifying my account (and even then, it may have just been an email). All I get is weekly bullshit spam about their fitness challenge contest... I guess coming from a former large spam operation (OptInRealBig), I wouldn't expect that, but then again, Azoogle doesn't spam me with crap emails, and they've also had a pretty shady past in the spam world.
Generally I find Azoogle to be the most competent at listening to what I have to say, and dealing with offers in a competitive manner. CPA Empire, well, my AM has never had anything useful to offer when I've asked questions.