I've not heard the Gallo speakers so can't comment on those. I have heard, however, the K2 and Nait 5i side by side sourced by Cyrus 6 SE CDP, firing through ATC SCM11 speakers. Both are very good, although very different.
The Naim doesn't have features of the Kandy, firstly. But SQ-wise, I preferred the Naim. It had a lot more sparkle to the presentation, and had more of......well, just more of everything. The K2, on the other hand will need very punchy speakers to really perform. The Kandy with the latest incarnation (this is just a personal thesis of thought) is just a tad on the safe side, certainly compared to the slightly boistrous LIII.
Before parting with your dosh audition audition audition. If you're still unsure, go back for another listen.
Good luck.