My opinion:
Cutie mark chronicles- Call me crazy, but I actually like this one more. Whenever I see him, he looks very cutesy, and friendly. It fits better with the baby dragon we all know and love. However, I do think that he looks too big, dinosaur-like to really look like a dragon.
Secret of my Excess- This design is really awesome. Whenever I see it, this is what a dragon should look like. Tall, muscular, and sleek. Though, of course since this is a more evil looking version of him, it doesn’t really fit what I’d imagine he’d look like if he was a adult (although this is greed-growth, so it’s suppose to make him look evil…)
I will also give thanks to QueenCold, for the source to help me with the Secret of my excess form.