The PS3 version would be the most accessible version as I have it, I would just need to set up emulation on my PC.
... oh wait, though, hm. The PS3 disc is a blu-ray, and getting PCs to read blu-rays is notoriously a pain. Moreover, my new PC doesn't have a disc-drive, I'm pretty sure my external USB drive is DVD-RW only.
I suspect in terms of modding, the PC version would be the most open.