Hi,
I have actually owned both preamps. Here is my ads when I sold the 725 and the Robert Koda was sold to a friend of mine.
https://www.audiogon.com/listings/lisab6b8-soulution-725-with-phono-retail-65000-solid-state
They sound almost polar opposite from each other. The 725 is much more analytical sounding will the Robert Koda is more romantic sounding. There are both very good preamplifiers but the Aries Cerat Incito S and Aries Cerat Impera 2 preamp are another level in every regard with much better voltage output which helps control your amplifiers better. In my opinion there are levels when it comes to audio and the highest level of electronics we have heard, as a company, and individually is Aries Cerat.
Cheers,