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.