The Royal have all the SPU attributes but has detail, refinement, soundstage, smoothness and musicality but more punch and dynamics than the Royal
You’re comparing Royal to Royal, but it’s probably Royal and Gold?
Just to make it clear and i hope you can correct it.
There are two versions of SPU Gold and two versions of SPU Royal, actually.
Never tried Gold (this is very old model from the 80’s), but i have modern 21st century SPU Royal G mkII which is the upgraded version of the origional older Royal GM.
The original SPU Gold has Elliptical stylus tip, but the SPU Gold Reference from 1989 has Replicant 100 stylus tip (much better in details retrival than any SPU out there).
Then the first generation of the SPU Royal GM model was released in 1998 to celebrate the Ortofon 80 year anniversary.
BUT the next generation Royal G MK II was released in 21st century and comes with Ortofon Replicant 100 stylus (as the SPU Gold Reference)! The addition of Ortofon’s unique Replicant 100 stylus and reduced tip mass ensures open and detailed sound reproduction for a purely exquisite listening experience. Electrum coils, consisting of a gold and silver alloy, provides uncolored and precise transmission of armature movements while the slightly modified damping system makes it possible to reduce VTF and achieves a higher level of linearity.
The Ortofon SPU Royal G mkII is clearly the best SPU cartridges i have ever tried.
SPU Spirit Ltd is another good model, but the elliptical tip is always inferior compared to the Replicant 100 on the proper tonearm.