Differences are subtle, buying a other pair of headphones is mostly a better investment than a high end DAC. Changeing headphone can make alot of difference, a other DAC not really. A good dac with a shitty headphone will still sound shitty. A great headphone with a shitty dac will still sound kinda good in my personal experience.

The XS has one of the widest soundstage for a headphone with exception sennheiser hd800s.

But it needs a good match when it comes to amp, not only are they powerhungry but source dependent too.

Recommended to use balanced cable as the stock un balanced cable is pretty bad and going to balanced is pretty big difference in this case, check other reviews about this

Try Hifiman Arya pretty sure it will satisfy most audiophiles needs