I’ve had the opposite experience, where NewPipe lagged behind PipePipe in terms of adapting to YouTube-related changes. It had something to do with updating the subscription feed (not that that function is totally reliable on either app).

I also observed this strange issue with NewPipe where if a notification sound interrupts a background-playing video, the audio would stay reduced in volume until the app was brought back to the foreground. A cursory search suggested it was specific to Samsung phones, but when I switched to PipePipe, the issue simply didn’t appear.

Grain of salt: I haven’t used NewPipe since switching in November.