Thanks for the explanation - do all of the programs/OS's you mentioned have the ability to stream from a PC then or only OpenELEC + Kodi?
Both OSMC and OpenELEC are Kodi based, so best suited as media centers, including streaming as you describe.
I prefer OSMC, however it is in alpha at the moment, but it's so easy to format the SD card and try both.
Use SD Formatter to get the full 64GB back, as the builds will partition out the SD card.