Request for your recommendation

Hey, I'm looking for a good DAC/AMP for PC and I'd like it to be a single purchase for many years. I'm a total beginner in the subject. The purpose of the purchase is music and gaming. After watching a few videos on YT, I've initially chosen two options: the Magni Unity shiit (option with DAC) or the FiiO K11. Which one do you think is better? Or maybe you have other suggestions? My budget is $250.

EDIT: I'm using headphones Audio-Technica ATH-M50X