Music appreciation is a personal thing. People who love Cook's genre of music probably would not enjoy Archie's style of music. and the same applies to Archie fans not appreciating Cook's music. Listeners of each found the other "boring" v :"screaming". What has been interesting though is that most fans seemed to actually get that both had exceptional voices for what they do. So what happened last night in a contest that could have gone either way?
I personally think it got down to the choice of the last song. Cook opted for contemporary while Archie repeated a non-contemporary song. Both sang their hearts out beautifully. Both earned the win. I suspect that when the judges remarks that gushed for Archie and crucified Cook conflicted with the absolute quality of Cooks performance it did infuriate many listeners stuck with knowing they just heard two great presentations. It doesn't matter that the judges retracted their critique after the fact and admitted Cook did a great job. I think an argument can be made that it goaded people to vote to make up for incorrect criticism but that alone can't explain how Cook garnered 12 million votes more than Archie.
Valid or not, I think the answer may be something as simple as that last song choice. No one can say that either has the best voice but they can say each has the best voice for their style of music contrary to what each side says about the other. Given that, Cook won this by being extremely smart by going Collective Soul. I think he may have lost had he picked a song in Archies category - Call it retro ballads.
What is true is that the two David's respect each other's talent and saw the other as a threat unlike fans who only heard their favorite and assumed they would win. Both will go far. Cook will sell more music simply because he is a versatile contemporary rocker but Archie has an International market to corner. perhaps along the line of a young Josh Groban if he wishes to go that route. If Archie goes that direction his career will be more lasting. It will be much more interesting to see how he develops in the next 5 years and what direction he will take.
It really does feel like we have two winners this year but don't make the mistake of thinking Cook is not the actual winner because he is. He won it with pure talent , an exceptional voice for his genre of music, and a very smart song choice.