Lapland is amazing but also crazy expensive. It is stunningly beautiful. The snow is deep and fluffy. You may get lucky and see the Northern Lights and it is absolutely freezing. It hit close to -30oC when we went.
Just look for any Lapland trip and they will take across the attic circle, you’ll meet Santa, maybe have a dog sled, snow mobile, ice skating opportunities.
I am sure Disney will be fun and the kids will love it but it will just be Disney.
I would price both up and then decide which you think is the more special experience.