Or I suppose the topic could be shifted to: What do you think of the Canonical Class choice for the Dark Urge?
Because the original question does seem, in fact, answered.
Agreed. The "canonical" race/class of Durge is in a sense a white dragonborn sorcerer per Blood in Baldur's Gate as has been noted, but as they've been designed specifically as a character that we can define race, class, gender, appearance for however we wish, we're all completely free to ignore that and come up with our own version depending on what makes sense to us.
As long as we don't go into the debate with the expectation there will be definitively right or wrong answers, and with the understanding that we have hardly any info to go on so it's mainly wild speculation, we can still have fun talking about what race/class we each think best fits Durge.
