OutOfGame asked the perfect question I think.
If you want to do things related to policy and macro, the Fed might be a good option. However, if everything else the same, the top 5 RA position stands out for sure. The Fed economists are respectable, but in the academic world, the professors at a top 5 are surely more 'in the game'. People know them more, and they do work that is more similar to what you might do during grad school, and after if you stay in academia. Those things give much better signals to a potential school. I would go on to say too, that it is harder to land a top 5 RA position (especially if you come from a lower / different school) than a Fed position.