I just had this same question, just want something simple for listing in the office. Ordered the Q4 off AliExpres because of how cheap it was.

Has anyone actually listened to either?

Fosi K5 Pro has a good amount more power and mic input. Both use TI NE5532 op-amps, not sure about the DAC chips. IMO it looks nicer too.

Don’t buy anything that has “gaming” written on it. It’s a fad.