Sym supreme is very useful champ, and among guillotine & dormammu, the second is better. The main thing in dormammu is his energy control from one hand, and from the other one - his damage is pretty low; Guilotine might be useful versus champs with regeneration, she may reverse heal ability into damage and increase damage with a help of souls (don't exactly remember whether she needs to be duped or not) .
So, I'd reccomend to rank up dormammu (after sym supreme surely)
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The main thing in dormammu is his energy control from one hand, and from the other one - his damage is pretty low;
Guilotine might be useful versus champs with regeneration, she may reverse heal ability into damage and increase damage with a help of souls (don't exactly remember whether she needs to be duped or not) .
So, I'd reccomend to rank up dormammu (after sym supreme surely)