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I am looking to get something new to add to my renegades and am having difficulty choosing between a chimera or the aegis defense line.

Edit
I am using them as allies for my chaos marine gunline

2x 10 scouting shotgun renegade veterans, 2 flamers, champion with power sword and covenant of slaanesh

Renegade command squad
Arch-demagogue, covenant of slaanesh, bolt pistol,
4 disciples with flamer, banner of hate, command network vox

C: Not enough information

What if you posted you army list so that we know what you would be adding it to

Because your two options do different things

What do you have so far?

Added it to the first post

Just so you know you can only take devotion heretek magus on the arch demagogue if he's your warlord which it sounds like he is not