Larger capacity means a faster dry time. There is more room for clothes to be tumbled around and air to travel through them. This in combination with a good sensor-drying system is a match made in heaven! The largest capacity as of right now is around 7.3 cubic feet, but in time that will probably change.
Choose a machine with a great sensor-drying system. Sensor-dry measures the moisture and temperature of air inside the drum. You set how dry you want your clothes, when they reach that dryness, the machine stops regardless of the time left. My unit never completes the full time it states.
Now dryers are not considered to be energy efficient, but the sensor-dry cuts the time on average in half! So to me, that is energy efficient.
Sensor-Dry cuts down on clothes cost as well. The over-exposure to harsh heat in the machine is what causes our clothes to shrink and get that lint-bally thing going on. The sensor-drying systems eliminate all of that. Some units have more than one sensor so check out for those, the more the merrier!
Many machines are beginning to come with stainless steel drums. This is definitely not a necessity; it just looks pretty. Yes, the tub will last longer, but people generally don’t ever have any problems out of their drums cracking. So if this is optional you can pass on it. There will be no difference in your clothes.
Less trips to the cleaners. Lastly, one cool feature most new dryers come with is a shoe rack. This rack is placed inside of the machine to dry shoes, sweaters, or delicates that may get damaged if they were to be tumbled.