<Can you offer any reasons [non biased] for choosing one over the other?>
Non-biased? Not a chance.<g> Seriously, the Rivco risers will raise and bring back the stock handlebars. What it won't do is change the relative axial position of your hands and wrists. The flat BA place your palms somewhat parallel to the ground. You can rotate the bars to droop the grips a bit before looking like an old boardtrack racer.
The Highlander bars (I'll explain the name in a sec) being taller and having more of a "buckhorn" shape to them, angle the grips downward so that your wrists are at (IMHO) a more ergonomically comfortable position. About 45 degress to the ground. Being so tall means you can rotate them back on the stock risers to get your spine in an upright posture, or rotate them forward for that cool Rockabilly Bobber look.
The highlander name was inspired by a T100 customer with degenerative disc syndrome... the same back problem I suffer from. I'm setting him up with these same bars (with longer cables/hose). He had an old Norton Highlander at one time which used similar high rise handlebars, so I thought it was only appropriate to -ahem- 'pinch' the name.
Mike
