Undoubtedly i would say human brain.Because human brain can make the computer and modify that as per its requirements.Which computer can't.

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Human brain. It has the power to invent new features in a computer .One more important thing human has feelings which is lack in computer's.So dicision making capacity of human is a high level better than computer.

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Computers are certainly more adept at solving quandaries that benefit from their unique skillset, but humans hold the edge on tasks that machines simply can’t perform. 

Due to digitization every body every where depending in computer. People also requiring help of computer even to recall by using computer brain. So computer has been called super brain.

Mother of the Computer?

Augusta Ada King, Countess of Lovelace was an English mathematician and writer, chiefly known for her work on Charles Babbage's proposed mechanical general-purpose computer, the Analytical Engine.

She was the first to recognize that the machine had applications beyond pure calculation, and published the first algorithm intended to be carried out by such a machine.

As a result, she is sometimes regarded as the first to recognize the full potential of a "computing machine" and the first computer programmer.

Human brain has made computer.

Human brain, but will ultimately be a close race.

It depends how you measure the outcome.
In a game of chess, computers win. But as was already stated, human brain made the computer. So it depends on definition.
If computers can be made not only to retain and use information (and do it fast, hence winning at chess, etc.) but also "think" to use the information to come up with new ideas and solutions, then computers would start matching the human brain in some way. The next step would be to impart computers ability to use intuition and be inspired.

With all that, it would be time to replace some human activities and have them performed by computers. To some extent this is happening in diagnosing diseases and even selecting treatment (but only based on putting information in so that computer can evaluate data more thoroughly and rapidly than physicians can).
Once computers advance in this direction, the next "profession" to be given to computers would politicians; this way, more of us would benefit from their decisions...