These are great looking toons. Honestly it depends on which style they're applied to for me. For example chest, legs, face and some back pieces (swords) look best to me with void. Hands, feet and head for phoenix and I normally only like cosmic with capes, and some waists. They all look great on weapons to me, though I'd go with phoenix on weapons. In order I would say: Phoenix Cosmic/void
I honestly love them all. I use them across different armouries and they fit perfectly with the style and colours and so on I used them with. Really not sure how I would rank them. Probably Void, Cosmic and then Phoenix for general use.
Phoenix Cosmic Void Although I have none of them yet so my veiw is from seeing others wearing them. I'm still saving for the phoenix first.
Void Material lets the toon look like in comics ,which is nice. Phönix Material is not bad but i would rather have the feat than the material and toons covered full with that material look awful. Cosmic Material is... well not my taste so to say.
Even though I have none, 1. I would say I like the void for a corrupted character, 2. cosmic for a quantum mechanics character, 3. and the Phoenix for a divine character, favorite will be the the order 321.