First, math content is the same either way. Every kid needs to learn the same concepts, no matter where they go to school or who their teacher is. What makes a difference – getting through difficulty on to success – is the teacher’s style of delivery and the kind of help students get when they’re stuck.
You can get a feel for Cool Math Guy’s teaching style by looking at the free sample videos. Preferences will of course be subjective, but you can hear how Dana’s delivery is clear and conversational no matter the topic.
When students get stuck on a problem, they get help by asking questions in class; asking classmates, parents, or tutors; or by finding other examples in their study materials. All of these options are available to students who learn by video – with the added option of replaying their video teacher’s explanation.