Which is The Greater Sum? - Puzzle

greater sum math puzzle
Which is the greater sum, that of the figures on the left or that of the figures on the right. Have a look at the figures and estimate it within two minutes :-

  5 4 3 2 1 - 1
     4 3 2 1 - 1 2
         3 2 1 - 1 2 3
            2 1 - 1 2 3 4
                1 - 1 2 3 4 5
            2 1 - 1 2
        3 2 1 - 1 2 3
    4 3 2 1 - 1 2 3 4
5 4 3 2 1 - 1 2 3 4 5

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