Capacity should match your usual batch size. A smaller cooker may suit one or two people and take up less cupboard space, while a larger one can help with family meals or batch cooking. Remember that a pot is not always used to its full capacity, so compare guidance about appropriate fill levels. Consider the counter space you can spare and where the appliance will be stored between uses.
Controls vary from simple low, high, and warm settings to programmable timers. Choose the level of control that fits how you cook. A timer can add convenience, but check what the cooker does when a program ends and whether its behavior suits your recipe plans. Look at the shape of the insert and whether it is easy to lift. Handles, lid fit, and a readable control panel can make the appliance more comfortable to use.
Cleanup is an important part of the decision. Confirm whether the insert and lid are dishwasher safe, and follow the instructions for removing them safely after cooking. Check the exterior dimensions, cord storage, and any guidance about using the insert on a stovetop or in an oven; do not assume compatibility. A slow cooker is useful when its size suits your meals and its care routine feels manageable, not simply because it offers the most settings.