I feel you should make it one board, by itself, and at the beginning of each thread you must post either "[VIDEO REVIEW]" or "[WRITTEN REVIEW]" so it will be easy to navigate.
Also, if you do a YouTube review, you should post your channel name so if two people do reviews for the same deck, it will be easy to tell the difference.
Also, if possible, you should make sections such as Ellusionist, T11, TBC, or other just to make it easier to find what you're looking for.