You can indeed compare The Room and RHPS, I have been to a public screening of The Room and it was hilarious.
I don't know which one you should watch first - this or Disaster Artist - either way it's impressive how closely they recreated the scenes.
Probably best is to watch The Room first, then Disaster Artist, then The Room again.
And make sure to get the full version, some versions you find on Youtube or so have the nude scenes cut out and you definitely want to see those.
