Dawn Summers or Georgina Sparks?

Neither

I DONT KNOW WHAT A GEORGINA SPARKS IS,SO....DAWN SUMMERS....I MEAN SHIT ,MICHELLE IS THE KEY.

More like worse. But, in honesty, I'd say Georgina. Georgina's a character you love to hate. Even though she does awful things, she's entertaining to watch. Dawn was interesting for one season and then did nothing but whine. Yes, she had reason, but still, she wasn't even enjoyable. If Buffy aired on a network with no commercials that didn't allow pausing, Dawn's scenes would've been my commercial break.

I don't have a problem with the actor herself because I can differentiate but she almost always ends up playing whiny annoying awful characters. Weeds also comes to mind. Maybe that's just what she enjoys playing.