I have an older Danby kegerator and it’s reasonably quiet, but you will hear it. It’s neither especially loud nor especially long cycle times to maintain cooling. I can’t speak to overall brand quality, but mine has served me well both when it was indoors and for the last year when it’s been in my garage in the south.
I imagine newer ones are probably a bit quieter than mine (at least 6 years old) but in my experience if a thing has a compressor, you’re gonna hear it a bit.