Better to stick with PC unless your PC spec is low, cause a decent PC will perform better than the PS3 version. It will only make sense if you go from PC to PS4 since the performance is more comparable.

Bear in mind that your hotbar/crosshotbar, gear set, macro, keybind, HUD, etc are save locally, meaning that if you decide to play on console you will need to setup the whole thing again. Took me a while to setup my setting again on PS4 but being able to use macro command to copy stuff from 1 hotbar to another class hotbar helps a lot.

If I not mistaken you can copy the FFXIV installation folder and run it on a different PC and it will still work, not sure on the proper steps though but you probably can find it using google.