I actually thought about it the whole day. In the end, there’s no damage type I actually like the most. I could say lightning, but it’s boring and I have only 2 lightning builds, iirc. Aether was my way to go in the early days, but then dropped it and stopped building aether anymore. Bleeding is the one that makes me happy, because my character hits for 250k per tick with one skill. Okay, my favorite damage type is %HP damage. Ha, get rekt.
Lightning!
Chaos is winning??? Damn… I need to have the title changed back to ‘most powerful’ :rolleyes:
Chaos because I’ve been most successful with my pyromancer
Chaos might be the strongest, (although some builds certainly are very strong!) but it definitely is my favorite. My chaotic converter will always be one of my go to builds http://www.grimdawn.com/forums/showthread.php?t=70696
Cold, and then Pierce I guess.
My favorite damage type is … Pet! 
why? because i am lazy, i don’t want to move my cursor over any monsters, that’s boring for me, what i want is just move there and everything blocking my way is gone by themselves
nothing can stop me from summoning pets 
Chaos, closely followed by Aether. Just because I tend towards ‘more unusual’ things 
Are you me? 0_o
My favorite damage type is aether because aether is the strongest damage type.
My least favorite damage type is chaos because chaos is the weakest damage type.
Fire since it has a multitude of item and class supports, plus I have fond memories of one of my first playthroughs in Beta choosing all of the Demo skills and drowning every enemy in flames.
I chose Acid as i have always enjoyed acid and poison builds in many games. I am looking forward to more Acid support when Forgotten Gods comes out.
Close contenders are Aether, Chaos and bleeding but i am always a sucker for elemental damage (all three combined).