I've noticed that a lot of vegan ("cream") soup recipes call for rice milk.....since I've never made a soup like that, I have ABSOLUTELY no experience.....but it seems to me that rice milk might contribute a cloying sweetness to the soup.  Wouldn't unsweetened or very lightly sweetened (like SoyDream Original or Vitasoy Original) soymilk work better?  I guess cow's milk DOES have naturally occuring lactose, so perhaps rice milk is fine in soups that would traditionally call for dairy milk.....But I'm asking you (anyone who knows more than me and wants to share their opinion)!!! 
I've also heard that oat milk is good for preparing savory dishes......