Are U-shaped window air conditioners actually quieter?

The U-shaped Midea inverter units in this list are marketed as ultra-quiet because the window sash closes between the compressor (outside) and the indoor vents, putting the noisiest components outside the room. Verified-purchase ratings for these models are strong, but no independent decibel measurements were available in the supplied data, so the quietness claim rests on manufacturer marketing and customer impressions rather than lab testing.