ATF (alcohol, tobacco, firearms and explosives) special agents?

1) is an ATF special agent job better than FBI special agent?
2) do ATF special agents get a company car, if so what is it.
3) what exactly does the ATF investigate. And some examples of cases. Do they do serial homicide? Violent crimes?
4) anything else about the ATF that wouldnt/doesnt tell you.
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