It's like a sandwich at 7-Eleven. Do you get the one that was made today, or the one that was made three days ago?

No, you get the one made today because the meat and cheese is fresher. Different 7-Elevens may cycle their goods out at different rates. You can't really tell*.

Same goes with CPAN mirrors. Do you go for the one that just picked up the hopefully bug-fixed version of Image::Size that was released today (not that it was, only for an example here) or the ones that still have a Flash-related bug in them from two weeks ago?

* As an aside, I keep going to Asian rim-owned 7-Elevens and get frustrated by the language barrier and general demeanor of the employees. Yet, I go to a few domestic 7-Eleven and get along quite well with the employees. Cultural differences, perhapse.