One is not necessarily better than the other. They are different approaches to the same end, each has its merits. It is more about what you may need or want. Here’s a pretty good discussion on the subject.
I’m sorry - to more directly answer your question in another round about fashion. I have had both Single Ended and Balanced amps & DACs and Headphones. I have enjoyed both and there is no discernable difference in sound quality whether the signal chain was balanced or single-ended. It more boils down to the synergy of the gear making up the signal chain that matters.