The primary difference between a multi-cooker vs an oven is the cooking method of each type of appliance. A multi-cooker is a compact kitchen appliance that performs various cooking tasks, like frying, steaming or grilling. An oven is usually a built-in appliance attached to a range that is capable of baking foods.
Another difference between a multi-cooker and an oven is the size and durability of each type of cooking appliance. Multi-cookers can be more efficient and take up less space as they're easy to store. Multi-cookers may also be a safer choice because many come with auto shut-off features, whereas an oven may not.