Ive used both. Contrary to whats been said by another poster; my experience with both with retipping is that they cut the stylus close to the suspension and adhere a new one on. Ive never experience just changing the diamond.
Both retipped Dynavectors for me. Both did good work. Audio memory being as unreliable as it is, my opinion is that retipping is like changing from one good amplifier to another. They wont sound the same as the original, it will be a little different. In each time, I got 97% of what the cartridge sounded like, but its never exactly the same. For 30% of the cost of a new cartridge, Im cool with that.
i dont have a Denon 103 and havent done any cartridge body mods so I cant comment on those. I’ll tell you this, Andy and Steve have told me what to expect from the work, and theyve been reliable with their advice. Steve is friendlier, Andy is leas chattier. Hope that helps.