These days, it makes little sense to me to own a standalone media device when modern mobile phones are so capable. The internal memory of phones is always on the up, but most importantly, many have access to MicroSD storage as well. It is my understanding that most recent handsets can utilise 64GB cards, whereas the newest ones can access 128GB. The most cutting edge MicroSD cards store something like 200GB. Even at the smallest, that’s thousands of hours of music in .mp3 format.
One thing to add that seems relevant is that if you are also seeking the best sound quality, the player itself has little impact nowadays. Lossless file formats and decent hardware do make a noticeable difference, though. The .flac format on my phone (Samsung Note 4) played through a media player capable of reading it (using Winamp), played through reasonable earphones (Sennheiser CX200) is a noticeable improvement over .mp3. It is not as noticeable as at my pc, but I feel it is worth the extra file size. Of course, the quality of the recordings themselves also weigh into it.
Hello! If you only ask me, I can not recommend anything other than mp3 256. This is ideal for both an ordinary guy and a musician. Our headphones are often unsuitable for higher quality. So don't mind, use download mp3. Large music portals that allow you to download songs immediately give you acceptable quality.