Plastic is made from fossil fuels, so from the sourcing of the oil to the production of finished plastic you have some ecological damage and emissions.
Clearly mining and sourcing Aluminum isn’t that great either.
The big difference tends to be recyclability. There really isn’t a great mechanism to naturally decay plastics and recycling them tends to be unfeasible. For example, less than 10% of all plastic produced is actually recycled so it mostly ends up in landfills or as mass litter in nature.
Aluminum is both highly recyclable but also *easily* recyclable. For example in the US roughly 70% of all aluminum is recycled and most consumer aluminum is roughly 50% recycled content.
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