There are three factors that come in to play technically, not just the software and the hardware but also the operating system. For example, I'm working with a 2013 Macbook Pro running OS 10.8.5 (Mountain Lion) that runs FCP7, PR CC, PR 1014, but won't run FCP X or CC 2015.
Some of the more recent operating systems won't run the older software--when you buy a new Mac you are buying the most recent OS.
Did your editor do any useful work on your film before you? parted ways? If you want to continue with a draft edit, maybe better stay in the same software.
The general word is that it's better not to switch software and OS in the middle of a project. I was able to switch an FCP7 project to a PR CC project, but am left with some problematic audio formatting because of the way FCP ingested the footage. I can't undo stereo tracks that were ingested and rough cut as dual mono.
Do you have experience cutting with any of these NLEs? I would imagine PR fairly easy to pick up from scratch--it seems a little more intuitive. But it can be hard to learn what all the little buttons mean in the interface, and which little buttons enable which procedures. The documentation is limited.
Independent/personal/avant-garde cinema, New York City