A:Answer The primary difference between them is the price and the features they offer. While they are all quiet, the 800 series is the quietest with a 39-42 dBA silence rating. I think the recessed handle becomes available in the 300 and 500 series. There is a "MYWAY rack which is adjustable, and a third rack for utensils and flatware on the top, which I don't think the 300 and 500 series have. In the 500 and 800 series, it has auto-dry. The 800 is considered one of the best dishwashers of 2019, and I would agree. There is a model that is rated even higher, but also has a price tag to match ($2000+). I am extremely happy with my 800.