Sdi seems more standardized i.e. More controllable and precise.
If money is not the issue i'd go with sdi.
Maybe not the best example but when you export stuff from resolve lets say to som hi comp format
Then you can see the vividness drop. Same thing with 422 vs 444 sdi i bet.
I personaly would go for 444 sdi.
Not maybe so noticable but there is difference.
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Margus
http://iconstudios.eu