DerekSTheRed
Explorer
My experience with the Dragon Sorcerer is that it's a bit of a glass cannon. All of his blasts are blast 3 but also hit allies. That makes it really hard to setup. Inevitably, he's pulled out away from the defenders and isolated making him a target for more attacks.
The DS has worse hit points and worse AC than the warlock (thanks to concealment) and the Chaos Sorcerer can stay safely in the back and hit multiple opponents randomly at least as often as the Dragon Sorcerer can get multiple opponents bunched together. There's a trade off there in damage vs. survivability in comparison to the other arcane strikers.
The DS has worse hit points and worse AC than the warlock (thanks to concealment) and the Chaos Sorcerer can stay safely in the back and hit multiple opponents randomly at least as often as the Dragon Sorcerer can get multiple opponents bunched together. There's a trade off there in damage vs. survivability in comparison to the other arcane strikers.