Inawashiro has awesome views and is a fair size.
Alts is more for young people who like jumps, rails etc and is very well run and modern, has the Burton Nippon open in February.
Nekoma is pretty good for park too, with nice snow.
Gran-deco is good for families, has the best snow but gets packed out and isn't very interesting.
If you are looking for a nice quiet day try Ura-bandai ski-jo. Old lifts, hardly any people, great snow and awesome food. Really good friendly atmosphere.
But my local in Fukushima is Hatori. Couldn't really recommend it if you don't live close but you can't b