I would disagree in this context - the career roles are different but the concept not dissimilar.
Getting out without prior work experience will put you in an entry role vs having work experience which shows employers you can get it done in the work place.
Op you can simply call top programs such as Syracuse and Indiana and ask about prior work experience for admissions and for career outcomes - how they differ by students with and without prior experience.
Personally I am pro MPA overall although in many cases an mba will serve a govt employee better.
I think the discussion here is about straight through or not. Call the two I listed (they are the top 2) and ask. Best of luck.