xmas trip w/kids

Hi guys and gals, first post.

Deciding on my xmas trip, either to Rusutsu or Tomamu.

Will be travelling with kids (1, 3 and 5yr old)
To those that have travelled to these 2 resorts

1)which children ski area is better?

I see that Rusutsu has the Crayon shin chan school, pretty much can cater to my 3 and 5 yr old (skied once at Akan lake)
How is the school/ children area at Tomamu?

2) Wave pool and children activities.
which resort has more children fun?
Also I know onsen are pretty strict on tattoo's how about pools?

3) Snow condition.
Generally how is the snow in december?
Niskeo was great feb/ march this year when we went and Akan was also pretty good in early feb.

Club med is out of the question as they don't teach 3 yr olds to ski.

Thanks in advance.