The project dac s2 plus is a really good dac at its price. I own it and added the ifi elite power supply and that was a further huge improvement and lowered the noise floor and removed glare (edgy sound) and added clarity.
I recently compared it to a loaner chord qutest (fully broken in).
While the qutest had a bit more inner detail and expansive soundstage the dac s2 plus had clearer and more extended highs and a more lively sound, less laid back compared to the qutest.
the ifi elite power supply made less of a difference with the qutest as compared to the s2 plus.
I am keeping the dac s2 with ifi elite power supply for now
I have not yet heard any of the denafrips dacs.
I recommend you try the ifi elite power supply on your project dac s2 plus
the ifi elite power supply takes the s2 plus to a new level of sound