Plastic or alumnium drive caddy?

I've got a 2.5 SATA drive -5200RPM - I'm going to be using as an external hard disk. I don't have ESATA on my machine, just USB. So I've ordered an external USB caddy. It's turned up and I've fitted the drive okay, and it's working so far. But it's plastic, whereas I notice some available ones are aluminium. It's USB powered, and has no additional cooling. Is there any advantage to me swapping the caddy for an aluminium caddy? And is there any make or brand that's recommended?
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More about plastic alumnium drive caddy
  1. Personally, unless there is a "meaningful" price difference, I would prefer an aluminum one because, depending on the quality of the plastic, it is probably more durable and would transfer heat better.
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