Yeah, I couldn't decide, so I ordered both kinds, lol. I'm REALLY bad with online shopping. Amazon Prime certainly doesn't help since I dont' even need to actually take my credit card out of my wallet, lol.When the chicks get older I would recommend horizontal nipples on the sides of the bucket. They leak less, freeze less in winter, and plus you can put the bucket anywhere and not have to hang it since the nipples are not on the bottom. I made a 5 gallon bucket horizontal nipple waterer and love it. Mine caught on same day but they were pretty old and moved outside. I mention when they are older because sometimes for babies the horizontal ones are harder to press down on but others have no issues