Just out of curiosity, what in the history of Black Watch entitles me to wear it? I had already decided on the Stewart Hunting, but if there is a historical reason for me to go with Black Watch, I may just change my mind.
Over the years, a misconception has developed around one of the alternate names for the Black Watch tartan; orginally called "government" tartan, because it was designed for the Scottish Regiments of the British Army, it was also known as a "universal" tartan, because at one time, London wanted all Scottish regiments to wear it, although this was not achieved. I believe this classification has lead to the misconception that it is a "universal" tartan that anyone can wear.

Nevertheless, it has become a general tartan for anyone to wear because of precedent (the same with Royal Stewart) -- and Stewart Hunting is also a "general" tartan that started out as a military tartan as well -- in fact, the Royal Scots, the 1st Regiment of Foot, the oldest in the British Army (raised in 1633), still wear the Hunting Stewart, along with several Scottish Commonwealth units (Canadian Scottish, Pretoria Highlanders) and the 10th Princess Mary's Ghurkha Rifles.

Both are fine tartans, but I would stick with the Stewart Hunting.

Cheers,

T.