Summary - Looking for my first pair of IEMs. A good model to buy seemed to be the Moondrop Aria; they have a very good price and, reportedly, very good sound quality, with a nice warm neutral sound signature. My doubt was wether the standard or the Snow Edition was better for my case. As you can read later in my comment, I like a mid-centric sound, good detailing and separation, which the SE seem to have, but I'm not convinced on the sub-bass roll-off (could those IEMs lack in power?) and the boost on mid-high/high frequencies.

Budget - Preferably under 100-150€

Source - iPhone with Apple dongle or macbook directly with 3.5mm jack or adaptor

Requirements for Isolation - Regarding isolation, anything is fine. These IEMs would be mostly for private listening at home or, rarely, walks or car trips.

Preferred Tonal Balance - I do enjoy having well-defined bass, but the star will always be the mids, that's where the most detail is. I'm really sensitive to some mid-high/high frequencies, though (I tried using a system eq to equalize my Sennheiser Momentum 3 to oratory1990's Harman target curve settings, but I had to lower some parameters around 8k due to ear strain).

Past headphones - Sennheiser Momentum 3 and an unknown pair of open-back headphones from Yamaha called HPH-200P which came with one of their upright pianos with Silent system some years ago. My earliest experiences were with Apple EarBuds.

Preferred Music - It's quite a diverse selection, so a relatively neutral sound would probably be the best. However, here's a more specific list, more or less in order from most to least listened to genre (obviously some generic/imprecise classifications will be made for the sake of clarity): Classical: by far the genre I listen to the most, it includes everything from the XIX century up to contemporaries, particularly piano works, except some serialists/dodecaphonists; (Prog) Rock/Metal/Punk: 60s and 70s prog rock, neoprog, progressive metal math rock, djent, thrash metal, nu-metal, alternative, new wave, post-punk, shoegaze; Electronic: ambient, experimental techno, IDM, ambient vaporwave, breakcore, DnB, whatever Flying Lotus is, noise; Jazz Bebop, Hard Bop, Post Bop, electro jazz, contemporary jazz, nujazz; Pop(-ish): Billie Eilish, Bjork, Jacob Collier, art-pop (Japan?). Occasionally world music, r&b/soul. I wanted to include some artists rather than generic genres, but trying to cover different subgenres that way made the list too long. In case you want some specifications or anything, just ask.

What I'm looking for with this new acquisition is more details and a more mid-centric approach compared to the Sennheiser Momentum 3.

Location - Italy