Do you have experience with anemones? If not, then most will recommend a bubble tip anemone because they are hardy nems that can do well in less than optimal conditions, but there's no guarantee that the snowflakes will take it as their host.
Since snowflakes are ocellaris, their natural host anemone are H. magnifica, S. gigantea, and S. mertensii. All are considered difficult anemones and not recommended for those who don't have experience with anemones. Specifically, they are not good shippers and tend to get infections that require treatment.