Frontloaders are typically very quiet when tumbling/washing/rinsing. Some are noisy when draining, the pump may generate a chug-chug-chug sound when the drain flow slacks off. Most tend to be somewhat noisy during spin at fast speeds .... nature of the beast when a motor and a drum/tub assembly full of clothes is rotating in excess of 1,000 RPM along with the oscillations and vibrations that may occur.

Noises and sound level are difficult to quantify, subjective to an individual's perception and also affected by environmental factors at the usage location. The noise level generated by any given machine may vary considerably from one load to another depending on load characteristics.

Other people hopefully will advise on their experience with specific brands/models.

electrolux is extremely good vibration wise (they have a 2nd floor guarantee) and pretty quiet.