Where do I begin?
Well, there's the:
Owning something that's rare and less seen,
Custom (and beautiful) paint schemes,
More HP and torque to play with,
Different engine along with many of the mechanical components,
Chrome: front end, wheels, controls, covers, etc.
Different floorboards and grips than are available on a standard Harley
Stereo extras: amps, speakers, headsets, etc.
Different (heated) seats, plus heated grips,
Different guages,
And many other reasons!
So why would you buy an Audi instead of a VW? Or a Lexus vs a Toyota? Or a Macbook vs a Windows laptop?
Maybe it's just personal preference, sometimes for a feeling of prestige or additional pride in your vehicle, who knows, but I would rather own a CVO instead of a standard Harley. Not being a snob but I just love the things! But then I've been blessed to have the ability to buy one, too so if I couldn't afford a new one, I'd look for a good used one, or buy a standard Harley. But it would be a Harley nonetheless!