I rarely vote for anyone until the finale. Sometimes I'll vote before then if I think the judges have been especially unfair to a contestant. Last night I voted for Brandy.
I don't want Derek to win again. I like Bristol, but she doesn't deserve to win. I like Kyle, but not Lacey. That leaves Brandy and Maks.
I think people vote for a particular contestant for all sorts of reasons - proficiency at dance being just one of them. When I vote, I give more weight to the performance than I do to the technique. I don't remember who was in the finale against Emmit Smith; I voted for him because even though his technique wasn't as polished, I enjoyed watching him more.
I also don't like the show casting people with dance experience and will vote for their competition.