Gallas sees the Pole as a safer defensive bet.
He told the Daily Star: "Oleksandr Zinchenko's first thought is to go forward and get on the ball, which can leave Arsenal's defence open," said Gallas. "Arsenal are a lot more solid with Kiwor at left-back. They have the players in front of the defence that can make the difference.
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"White has been chipping in with assists, but he hasn't been as marauding as he was last season his first job is to protect his team-mates. That has also helped William Saliba concentrate on doing his job.
"It is a very strong defensive line. It isn't a coincidence that Arsenal have been scoring so many goals with this back four protecting the team."