well bewilderbeasts are an incredibly rare species the icewing harmy has at least 2 thousand soldiers and icewing train from birth to be powerful iceicle was like 4 when she killed crane and has fought in multiple battles so I'm taking the icewings
Icewings hands down. An approximately equal, or maybe even smaller force of dragons without weapons were already able to defeat the Bewilderbeast, although the BB's ice resistance might make it a little more even.