Just stumbled across some interesting articles comparing Capture One and Lightroom to Aperture:
Aperture, Capture One and Lightroom Walk into a Bar (Part 1 of 2)
Why I Chose Capture One Pro v8 and Abandoned Aperture 3 (Part 1 of 2)
(For each article, see the "More Like This" section on the page for the link to Part 2)
As both sets of articles compare the editing as well as the file management features of the various programs, I elected to create a new thread.
As regards file management specifically, there is also this article:
Your Aperture Files Imported into Capture One Pro 8; the Good, the Bad and the Missing