Hello! I own both the hip DAC and the HD58X and its a good match. The hip DAC is your usual iFi sound, on the warm side without overly doing it, I find it quite enjoyable and is easy to listen to for long periods. I use the 4.4mm on the hip DAC, the 3.5 is fine too.

I have a set of old murder treble IEMs from Beyerdynamics and they still want to murder me on the hip DAC, nothing will ever fix those it seems.

Take the ASR graphs with a grain of salt an trust your ears first and out of everything/anybody else. Your money, your taste, your choices.

They are both great products, get the one that has the functions you need the most.