1/2 HP vs 3/4HP, really a non issue. Garage doors are so light these days, especially when installed correctly. A 1/2 HP opener will have no issues opening a double wide garage door.
Buy the best you can afford. Mine is 3/4 HP which is massive overkill for my single car garage but bought it for the big dome lights on either side. I like a nice bright garage.
And ya, belt driven or screw driven are noticeably quieter than the old chain drives. Worth the money if you prefer it quieter.
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