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"Unrestricted" means that there are no compatibility restrictions considered, so the result may play only on PCs with sufficiently complete decoder software, but playback on consumer players is not certain.
The difference between a "High" and "Extra" quality template is mostly placebo: More efforts to find redundancies and similarities in the video, taking more time to calculate, but hardly giving noticably better quality at the same filesize, and making hardware player compatibility even less certain.
If you want to know the exact differences, load both XML files of these templates in a tool which highlights source code differences (e.g. windiff, Beyond Compare, etc.).
But I doubt it is worth the efforts. Templates in general are a concept ready for deprecation for the x264 encoder — because the trinity of speed "preset", content "tuning", and playback "device" options is sufficient in most cases. Less experienced users may not know all the advanced parameters good enough to take responsibility for their own changes; more experienced users may have contributed to the device option instead.
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