Multiple engine choice

What are the reason that different airliner will choose different engine brand/type. For example: A330s has 3 different engine, each are GE; P&W and RR. Qantas use GE, Delta use P&W and Cathay Pacific use RR.
Why? ;)

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  • Cost
  • Engine Power
  • Engine Efficiency
  • Maintenance Costs Long Term
  • Whether the plane is for long or short distance
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Not sure about this but rest of them are good points :)

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well if you aren’t sure why did you ask if you know the answer already.

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I didn’t know the answer, that’s why I ask the community :(

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