Dishwasher shopping has a lot of overlapping cycle names and marketing terms — a few real differences underneath explain most of what matters.
The number worth checking: decibels
Dishwasher noise is measured in decibels (dB), and it's one of the more meaningful specs to actually compare, since it directly affects daily life if the kitchen is open to a living space. Roughly speaking, anything in the mid-40s dB or lower is considered quiet enough to run unnoticed nearby; high-40s to 50 is noticeable but tolerable; anything higher is genuinely loud for an open-plan home. Unlike most specs, lower is simply better here — there's no tradeoff to weigh.
What a soil sensor actually does
A soil sensor measures how dirty the wash water is partway through a cycle and adjusts the wash time, water use, and temperature accordingly — dirtier loads get a longer, more thorough cycle, and lighter loads get a shorter one. This is genuinely useful for saving water and energy on lightly soiled loads without you having to guess and manually pick a shorter cycle yourself.
More cycle options isn't the same as better cleaning
Dishwashers increasingly ship with a long list of specialized cycles — quick wash, sanitize, delicate, and so on — but the actual cleaning performance for everyday dishes comes down to more basic factors: water pressure and spray arm design, water temperature reached during the wash, and effective drying method. A dishwasher with fewer cycle options but strong fundamentals will out-clean one with a dozen cycle names and a weak spray system.
Drying method is a real difference
Traditional heating-element drying uses more energy but works reliably regardless of what's loaded. Condensation drying (using a stainless steel tub's temperature difference to condense moisture) uses less energy but can leave plastic items — which don't hold heat the way stainless or ceramic dishes do — noticeably damp at the end of a cycle. If plastic containers are a big part of what gets washed, this is worth checking specifically rather than assuming all "energy efficient" dishwashers dry equally well.
The one thing people forget
Check the interior rack configuration and adjustability against the actual dishes and pans you own, not just against the showroom display. Rack height adjustment, tine spacing, and third-rack utensil space vary a lot between models, and a dishwasher that's technically top-rated for cleaning can still be frustrating to load if it doesn't accommodate your specific cookware well.