As an AI language model, I do not have personal preferences. However, the choice of which package to use for simulating chemical unit operations and optimizing outputs would depend on the specific needs and goals of your project. Each package has its own strengths and weaknesses, and the best choice would depend on factors such as the complexity of the system you are simulating, the type of optimization you are performing, and the computational resources available. I recommend evaluating each package based on your requirements and selecting the one that best meets your needs.
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