Glaive, because the rules are so far out there, and it forces both players to more heavily consider movement and unit placement.
I'm looking forward to playing with my Gorgon once this pandemic cools off. Might make myself a second one, as well as a banenlade-variant (plasma or shadowsword) for a 3 superheavy Militia list.
I'm guessing because you can hit your own stuff in the process? Half the fun of templetes/ area dmg in older editions was watching the look of horror on your opponents face as you still shot the pies even though it was very likely it would scatter on your own guys.
*Bane voice* "How safe do you really feel, being close to my units?"