I’ll try to give you as much info as I can. I own the Magni & the 2019 version of the Vali.
It’s a really tough call between them. Gun to my head, I’d take the Vali. That’s a preference thing for me. I enjoy the thick, almost syrupy sound of the Vali to the thinner, yet more detailed Magni.
When you hear the Vali (going by my thoughts and what random friends and family have said), the overall sound is just premium. You get decent sound stage but a thick, bassy sound that is really, really nice. Not super detailed, but just good enough where you aren’t feeling cheated or frustrated. The vocals aren’t up front, but they aren’t so far back you have to strain to hear them. For me, they are in the perfect location.
Sorry to be general, but I’d describe them as smooth, warm, good percussion, premium.
The Magni are a different animal. The Magni are a thinner sound with less sound stage, but wow, really fantastic detail. Very punchy and fun. Vocals are closer and bass is less. But what a fun, punchy, tight detailed sound. What I like about the Magni vs. the NDh20, is the headphone didn’t scream closed back soundstage. Once my brain adjusted, all I thought about was how detailed, punchy and fun the Magni is.
If I gave a report card score, I suspect the Vali would win overall with B+ in all categories, where the Magni would get more A+'s in some categories and C’s in others. The Magni is the better deal. I think with the Vali I felt, “I got what I paid for”. With the Magni I felt like, “I can’t believe they only cost me $525”. I also have heard and believe it that some people prefer the Magni. My friends and family have been split 50/50.
If you want the better deal with super detailed, punchy and just plain fun sound and you don’t care as much about width of sound stage with slightly brighter sound, Magni is the better choice.
If you prefer a thicker more premium overall sound, the intention is long listening sessions, you appreciate decent sound stage and don’t like brighter headphones, choose the Vali.
Neither are great with comfort and seal. Sound makes up for it, but I didn’t love the headband cup seal for either headphone. You can move it around and find the perfect spot, but it’s just a little bit annoying to have to do that.
Hope this helps and let me know what you decide!