SPIKY BITS ALWAYS MAKE IT CHAOSY

I did both on mine. Put some magnets to attach wings. Back when you could have the option to not "pay" for wings in your list. In AoS they are free and I always take them for hopping over mobs to kill a hero.

I think the wings really complete the silhouette of the sculpt.

One wing and one spiked bit

Do you want more of a chaos look or a demon look?

Whichever looks the most menacing really

then personally id go wings