In this addition to the season 7 DVD, I found this a good 45 minutes as a prequel to GoT
I never read the books so this was very interesting. I watched it while rewatching the series from blu-ray. It made me understand the ending of the show a bit better.
Should the fans watch it instead of "Houses of Dragons"?
Probably wouldn't hurt. The cartoon tells it in 45 minutes where the series would give more detail.
Well, I read "The World of Ice and Fire", GRRM's history of the Targaryan Kings of Westeros. Does it cover the same ground?
I've never read the books so I wouldn't know.