Windsor Windows Vs Pella . The higher quality fiberglass used in marvin’s windows allows for a cleaner and smoother finished surface, which are more appealing than pella’s. Today we look at two of the more popular and biggest window companies in canada: 1003 Hoppe French Casement Hardware Corner Drive Mushroom Cam Style from www.windowpartscenter.com The higher quality fiberglass used in marvin’s windows allows for a cleaner and smoother finished surface, which are more appealing than pella’s. Also keep in mind, to get. Pella has been manufacturing window and door products since 1925.