The best replacement for fiberglass windows is vinyl.

The best alternatives to fiberglass windows are rated as following:
★★★★★  vinyl
★★★★  vinyl windows
★★★  aluminum clad
★★★  wood windows
★★★  aluminum
★★  wood
★  fibrex
★  composite windows
  pella
  aluminum windows

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No companions for fiberglass windows have been suggested so far.
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Scale is based on the average worldwide traffic of fiberglass windows in all years. Click on graph for more.
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