The D.C. Circuit has 10% criminal cases. 5 circuits have above 25% criminal cases. The D.C. Circuit has over 30% administrative cases, most circuits have under 10%. The D.C. Circuit has almost no private prisoner cases (cases by prisoners against state officials for violations of rights), while most circuits have over 15%. The D.C. Circuit has over 20% U.S. civil cases (civil cases in which the U.S. is a defendant), while most circuits have under 5%.
Even within those divisions there are relevant distinctions. An appeal from the Board of Immigration Appeals is an "administrative" case, but it's a much simpler matter to resolve, usually, than say a challenge to an EPA regulation. So while the 9th Circuit has almost 30% "administrative cases," each of those are likely much simpler to resolve than each administrative case on the D.C. Circuit's docket (not many people are getting deported from D.C.)