With a delay start option you can schedule the machine to begin at a later time. You can also set the machine to wash at night if your electricity is cheaper outside of peak times.
With a lower noise level for drying there is less disruption and you could use the dryer at night.
With a bigger drum you can fit in larger items such as duvets, or do a big load at once.
This is the maximum amount of time you can set the machine to begin in the future.
Condenser dryers extract the water from the damp air in the dryer and store it in a container. They are good because they can be put anywhere in the home whereas vented dryers should be next to an outside wall.
More weight capacity helps if you want to wash something heavy like curtains. A traditional household machine can hold around 6kg, so with a machine much bigger you may waste energy using it when only half full.