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I have two doubts in the following sentence:

Plastic has the lowest production cost but the best efficiency against other materials.

  • The first one is if it's correctly written because I want to say that plastic has lowest production cost and the best efficiency at the same time. So if there's a better way to write it, please tell me.
  • The second one is if I should use "and" instead of "but" and why.

Any other suggestions are welcome. Thanks.

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I think that you should use and, because low production cost and best efficiency are similar ideas (not contrasting). But you should probably say compared with instead of against.

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