Comments from a friend that borrowed my Pontus to compare to his Yggy:
- The Pontus communicates more tonal color. The Pontus is better at presenting all parts of the music with balance. The Pontus also presents with more reverb.
- The Yggy is more emphatic in how it conveys pace. The Pontus seems more realistic in its pace.
- The Pontus sounds more relaxed and laid back in its presentation.
I've heard his Yggy as well though not a head-to-head comparison with the Pontus. I think his Yggy sounds quite good. FWIW, he listens to a lot of 80's rock and so decided to stay with his Yggy as it seems to convey the rhythms of that music with more force.
I listen to a lot of acoustic music (Classical, Jazz, Vocals) and think that the Pontus is probably the better choice for me between the two with more tonal color, reverb, air and presence in its presentation.
Also, my friend tends to listen for only 20-30 minutes at a time due to family obligations. I'm often listening for 2-3 hours at a stretch so listening fatigue is more of an issue for me. The Pontus exhibits no digital glare or harshness at all for me.