Why did having the higher ground work for Kenobi against Darth Maul but not Anakin against Kenobi?

I was always confused on why Kenobi would say this, considering he beat Darth Maul even though Darth Maul had the high ground.

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UPDATE: Let me correct the question. WHY DID THE HIGHER GROUND WORK FOR KENOBI AGAINT ANAKIN BUT NOT FOR DARTH MAUL AGAINST KENOBI?
Why did having the higher ground work for Kenobi against Darth Maul but not Anakin against Kenobi?
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