Only problem with spawning the 10 bells ones, is that people are so focused on the 20 bells ones that I am not sure the 10 ones will die either. I spawned 3 20-bells ones, 2 died at last minutes, one will escape now with over half hp left. Out of those 80/90 level snow dudes I poked, over half of them run away.

If we assume 2RBs per 1 snow boss killed and 100% guarantee that melted ones would die each poke/RB - then its basically what ever you do. But if you need more RBs per snow boss death it would be better to kill only melted ones.

I do at most 250k with full team 1RB attack on those snow guys, not that much better on melted ones, but they have like half the hp of snow ones.