DAC chips themselves do not tell you how something will sound, especially when you're talking about driving headphones from a DAP.
If you want more accurate overall sound, it's better to use audiophile DACs, amps, and DAC/amps rather than relying on DAPs alone.
The AK4490 chip is good and is used in the Schiit Jotunheim, Bifrost, Modi 2, and Fulla 2. (But it's sort of entry-level as far as serious DACs go.)
What's your budget? Do you need something portable?