Second tonearm / cartridge

Aidas Gala Gold is superior to Benz LP-S ime just to say

@rauliruegas is right. SPUs are very old tech and Ortofon makes much better cartridges now that are much quieter with a lot more detail. I cannot give you a tonearm recommendation because I would never use a tonearm with a removable headshell (with contacts) or one that is not straight.

I think I understand the OP here. He is not looking for "better" like @mijostyn or @rauliruegas suggest in their answers.  He is looking for contrast to his current combination. This is similar to my two arm combo of FR-64S/Koetsu and Kuzma 4P9 Lyra or SS Hyperion.  Like @mijostyn ​​​​@rauliruegas, I do prefer the more accurate detail retrieving presentation of the Kuzma/Lyra/SoundSmith so that is the arm I use the majority of the time.  But, there are times when the fireplace is hot and the Jazz is cool and the Koetsu does the trick.

I’ve run a Royal N on my Schröder Reference for the last couple of years and recently switched back to a Proteus. The SPU has a softer rendition of the leading edge, music swings rather than rocks, though the results were very enjoyable even with Metallica, it’s just a bit less pacy. Music has a strong body to the sound that make up for it and gives piano the right sort of heft to be convincing and if you can align the stylus well the soundstage is huge with symphonic works. The Doors were magical too.

I did find static a bit more of an issue with the SPU a 3g than with the Proteus at 1.8.