The blue is an upgrade. The red has is an elliptical diamond tip on a metal shank. The blue has a nude elliptical diamond mounted to the cantilever.
The tip mass of the blue is less than the diamond/metal combo. It is also significantly more rigid.
The result will be better transient response. The FR of the blue is marginally more linear. FR of the red is 20Hz to 20KHz +3/-1 db. The FR of the blue is 20Hz to 20KHZ +2/-1 db.
A diamond tipped stylus versus a Nude diamond, is a definite benefit in favor of the nude diamond.
Here is an analysis of a transient from and actual LP of the red versus the blue.
The red.
The Blue.
Note those are not FR graphs, but an instantaneous spectrograph if an instant transient and NOT a steady state sign wave.
That improvement will be audible, and it won't actually be that subtle.
The analog world is quite different from the digital world as far as increased precision in the mechanics of the play back system has significant sonic improvement.
The take home is that increase in build quality and therefore cost does bring real improvements.
This is a forum where it seems to me few members have experienced really high end analog sources, both disc and tape. The results of higher end systems are far superior to the run of the mill. If you were in my room, you what be astonished at the quality of the analog sources, even the gear that is half a century old or more. The major difference is the time, effort and expense required to achieve that level of quality compared to current digital sources.