The Denon 103 series is not a good match for the Rega or Technics arms at around 9 grams effective mass for the Rega and, well, much less for the Technics, however the Zu versions add enough mass to get you in the ball park.
The best match and sound, to my taste, would be the Dynavector 20XL. Second would be the Ortofon Rondo series, which were designed on the Rega arms, or even the Denon 301.
The best match and sound, to my taste, would be the Dynavector 20XL. Second would be the Ortofon Rondo series, which were designed on the Rega arms, or even the Denon 301.

