Centipede VS St. Augustine

Which grass, centipede or St. Augustine, will eventually become the prodominate variety if both are in the same lawn? Last house had a St. Augustine lawn that did not require much care other than a yearly fertilizing and mowing about every 10 days during the active growing season. It kept all weeds out of lawn with no chemicals or very little required. Current house has a centipede lawn and while the mowing schedule is about the same the weeds are running rampant and require what I consider an enormous amount of chemicals to keep them under control. Considering plugging current lawn in early summer with St. Augustine if it will "take over" from the centipede. Thanks for any and all assistance.
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f4forever wrote:

Was always under the impression that St Augustine would always out compete other grasses in same lawn. (Assuming the lawn is located in where St. would be expected to flourish). Centipede has a slow growth rate compared to St. Augustine.
Lar
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