The term of Dekalbinization of Gwinnett came from yours truly.
I have shouted this from the rooftoops for over 2 years.
Other posters have hit the button in regard to this comment, being out of control, rubber stamp developer growth and crime issues moving north from DeKalb into Jimmy Carter to Pleasant Hill.
Today, DeKalb and Gwinnett can provide 2 extremes in regard to county government which come out to equal results. In DeKalb you have "The CEO" Vernon, God Help us all if he wins the Senate seat. Cynthia McKinney II anyone? who's wink wink, nod nod, to his buds has led DeKalb into financial turmoil.
In today's Gwinnett, we have, well let's just call it the Ole' Slappem' on the Back White Bread Blue Bloods

who have became developer patsy's overnight. Gwinnett, which was lush green land space from Exit 104 North has now turned into what was stated above. A strip mall ladened, cookie cutter developed concrete jungle. Of course, never mind any infrastucture to support it.
All in all both counties have encountered the wounds of rapid growth over the last decades due to the influx of Rust Belt Refugees, illegal immigrants, and those running from the City of Atlanta itself. It's not about who has the "better" county it is the overall trend happening to the counties, just as DeKalb took the initial brunt, Gwinnett is now suffering the pain.
Who knows, as "THE CEO" moves onto other greener pastures to bankrupt, DeKalb will benefit, maybe, providing they don't go down the same road the City of Atlanta government did by electing another incompetent. As for Gwinnett? Right now, the tunnel is still dark. The government is entrenched, and though homes do not sell, permits for developers are still being issued, though strip malls are vacant, more are going under construction, though traffic is at a standstill by the Mall of Georgia during the weekend, we are building baseball diamonds without the capital to pay for it. Oh yes, and now we may get the final blow, MARTA

Yes, MARTA. another deficit ridden transportation system that WILL NOT work. Why? Well, in Gwinnett the current beaucrats will use it as an excuse to issue another thousand building permits! In short, more taxes, higher crime, and just as much gridlock as the county has at present.
In short, we are suffering the consequences of rapid population growth (120,000 per year in the metroplex) without common sense planning from our elected government officials. The best example here is the Chairman of Gwinnetts planning commission, which happens to be the largest developer in the State of Georgia. Rather sad isn't it.