I don't think Nod is an option at all, compared to kaspersky. But I think BitDefender is better. I have it right now, and seems alright.

You definitely could compare them with heaven and hell.

Well, I'm a college student, and in my class no one's even half as good as me in programming. BUT, I'm the only one who hasn't passed Maths 2(The one with the multiple integrals) and I've failed twice up to now. So I don't think that they have a direct impact on each other, at least not for me.