The larger the tub, the bigger the load it can handle. Maytag's Neptune even features preprogrammed buttons set to deal with specific stains. Many machines have automatic detergent, bleach, and fabric softener dispensers, as well. You'll need to buy the kind your laundry room if outfitted for. But if you're building a new home and have a choice, gas dryers usually cost less to run.
Larger drums handle larger loads and produce fewer wrinkles.
There are basically two ways to dry clothes. You can dry them for a specified period of time, or by relying on sensors and thermostats to tell you when your garments have reached the desired degree of dryness. Some dryers allow you to adjust the degree of heat and may offer a cool-down feature that cools clothes before they stop tumbling, helping to prevent wrinkles. Drum lights, which illuminate the inside of the unit, and buzzers, which signal when the dryer has stopped, are also useful. If you like to dry tennis shoes or other heavy items, consider a dryer with a removable stationery rack.