The videos of the LG DD show the decibel level above 70 dB. The Samsung one goes up to 65 dB for the full cycles and is around 55-60 dB for the silent mode which is more for night usage. My previous Bosch one was ridiculously loud in comparison. Since most of us don't own 2 machines to use side by side for comparison, the statement is anecdotal.If the shortest Cottons cycle is used, spin takes up close to half the time. But if the machine is fully loaded as it should be then spin takes up not more than 15% of the total duration. Meaning the most time is spent in the wash cycle. How quiet is Samsung's wash cycle? I bet someone used to an LG would notice how much louder the Samsung is.
None of which you will ever need. The only advantage of a four year warranty is resale value will be better and this is good for migrants. If you don't intend to sell within four years the advantage is superfluous.
The vibration level is also non-existent compared to my older Bosch machine. I keep the washing materials in a tray on top of the machine and it used to be quite violent with the Bosch during the rinse cycle.
Lastly, if LG DD motor is considered more reliable because of a 10-year warranty, then "just on paper" you can say that Samsung has confidence that its motor is more reliable.
Either way, I am not here to work as a shill for these corporates, but just wanted to share my relative experience.