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http://media.comicvine.com/uploads/0/462/82725-133074-blackfire_large.jpg

vs

http://media.comicvine.com/uploads/6/62250/1742171-comic_pg_8_1_large.jpg

Power Girl. Skilled Kryptonian > Tamaranian, and I don't think the power drain thing they do is enough to make up the difference.

It might be, actually. She's stronger and has more powerful blasts, so it stands to reason she'd be better at sapping Kryptonians than her sister is.