The best replacement for flex duct is metal duct.

The best alternatives to flex duct are rated as following:
★★★★★  metal duct
★★★★★  hard duct
★★★  hard pipe
★★★  sheet metal
★★  duct board
★★  rigid duct
★  sheet metal duct
★  non-insulated flex duct

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flex duct
metal duct
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