If you go with a screw drive opener, recommend a Single Piece rail. The openers that you get at your home store are in three pieces, with a screw in three pieces.

Genie has aluminum single piece rails as an "option part", but they're only available to "professional installers". So find an installer near you and do a deal. The reason is that the screw couplers can wear and fail.

Also, it your rail is exposed to the weather, aluminum may be a better choice. And there are no joints or seams in the single piece unit.

Regards,

Stan