I'm gonna venture a guess that they'd prefer courses taken in person at a lower ranked school or cc than online at a top 15 school. (Especially if you've done your undergrad at a top 10 or 20 school and proven you can hack the competition.)
I agree with DrLady that online courses would be rather hard, because they would require a lot of internal motivation to keep on track BUT I think online anything is sort of seen as sketchy just because the quality is very variable. To that end, if you have to do it online then yes, do it from a reputable school.