Bass, Imaging
For me, it’s about bass and imaging. Sapphire Tube; Boron; Beryllium Tube ...I believe I hear slightly more accurate bass, tighter, bass reverb or decay, and tighter imaging all instruments, but also involving the overtones of bass that do become directional.
Highs
the manufacturers talk about tracking high frequencies, so I mentioned it, but as I said, age 77, I can’t even hear them.
Sometimes they are talking about staying in the groove of torture tests, that was Shure’s claim to fame for the V15VxMR tracking at 1.0 gm. with the .0005 inch thick MicroWall Beryllium.
"The Shure V15VxMR features a proprietary Microwall/Be™ cantilever, an ultra-thin-walled hollow beryllium tube (0.0005-inch wall thickness, 18-mil diameter) that achieves the highest stiffness-to-mass ratio (6.25:1) of any stylus cantilever ever made. This unique geometry, combined with a MASAR-polished Micro-Ridge diamond tip, provides ultra-low effective mass and exceptional high-frequency trackability at a recommended tracking force of 1 gram."
Is it subtly better? Worth the extra cost? I encourage others to pay attention to the trend of many makers, what they say, the resultant specs,
and, after spending a heck of a lot of money on the rest of my vinyl system, I'm gonna pay the difference for Boron, or, save money by risking used Vintage
I've never heard anyone criticize Boron.

