[
docs.info.apple.com] would seem to answer the second question about colour space. Down at the bottom.
Because AI is not a temporal compression scheme it would likely be better for bouncing around between edit and mograph applications.
Then there's the issue of HDV actually referring to a number of variations produced by different manufacturers all using the same name but no being cross compatible. Which HDV are you using?
As the apple doc mentions, the bandwidth of AI is quite high compared to HDV.
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Sleeplings, AWAKE!