I've tried 2 different types of watering devices that you put into a bucket, the chicken nipple and poultry cups. After over a year of using, I prefer (and the chickens prefer) the poultry cups.
I have 4 of the nipples in the bottom of a bucket, the chickens need to bend their necks up to get to them. Since they are in the air, only nearly full grown chickens can use them, chicks cannot. They make it more of a pain to clean the bucket since they stick up and gouge your hands if you are not careful.
I have 2 of the poultry cups in a bucket sitting on bricks off the ground. Chicks as well as chickens can get to them, I see this being used more often. I'll be adding 2 more cups to the bucket.
I've filled the 2 types of buckets at the same time and the chickens definitely prefer the cups.
I've also noticed that bees will use the poultry cups, I might have to setup a bee watering station for them.