What would be the shortest translation for 'Home Delivery' on a restaurant flyer?
If you are working for a eatery, "外卖" is more native because you need to get out of the building to bring your customers food.

"送餐" usually appears in hotels or somewhere else like that. It's a bit formal because the food is prepared by advanced chefs and they are finely laid out but they are just sent to your room.

"送饭" is the worst, I suppose.