I have boarded in Nozawa once (last year), and several times over the last 4 years in Niseko, Hokkaido. Like somebody else said, Nozawa does have some flat areas as it's made for skiers. Snow quality is good at both, but Niseko probably has more powder (too much for me actually).
However, a BIG factor I think you should take into account is the village culture. Nozawa is an older, Japanese ski village. It's beautiful, and has many free old school, and extremely hot local onsen bath houses. It's not just a ski experience but a cultural one, too. MAny of the places to stay are minshuku, whic