Nihon Minkaen or Hida no Sato?

I have very limited time for my Japan trip and I would like to choose one of these.

Nihon Minkaen (Open-Air Folk House Museum), Kawasaki
Hida no Sato (Hida Folk Village), Takayama

What's the difference? and wWhich one is worth visit?

. . . are in completely different areas! If you are in Tokyo it's not worth going to Takayama just to see that village.

It's good you mention the Nihon Minkaen because it makes for a good day trip from Tokyo. The grounds are compact and immaculately kept. It's not as spread out as the Hida No Sato. The latter specializes in thatched roof housing whereas the Nihon Minkaen has a lot of farmhouses. There's more diversity at the latter.

Funny they say the Nihon Minkaen is in Kawasaki as it seems more like Camp Zama area.

Now if you are going to Takayama too, than that village is closer to the station and easier to get to (I walked).

A bit off topic but there's a similar village at Yashima near Takamatsu, that's also worth seeing if you are in the area. It features an Iya vine bridge you can walk across (which was pretty precarious).