User blog comment:Gracchus Mccarthe/What do you think is the best weapon in each of these four categories?/@comment-25967379-20150130164613/@comment-26971153-20150205210812

Comparison of RoF, Damage, and Pierce:

Hornet has +20% RoF and (roughly) +20% damage.

COM2 has +75% pierce.

COM2 absolutely demolishes dense crowds; Hornet wins against small numbers of tough zombies.