I've used vertical and horizontal nipples. If freezing temperatures weren't an issue, I was fine with how the vertical ones work (I did not have any leaking issue, which is a common complaint... the nipple was really snugly installed in the waterer) and the chickens preferred the vertical one. However since I need a waterer that works with freezing temps, horizontal is my preference. Haven't had any leaking/dripping issues, the nipples stay clean throughout the year, and it's just an easy, low maintenance way to provide water.
The waterer I use is this one: https://www.backyardchickens.com/reviews/premier-1-heated-poultry-waterer.11903/
In hot temperatures (around 90F+) I do provide additional water via large plant saucers. They're meant for the chickens to stand in to cool off a bit, but of course they'll also drink from them.
Another thing that's important to me in a waterer is to have one that's fully opaque, and to keep it in the shade on top of that. If no light gets in, no algae grows. No algae, no need to clean. My semi translucent chick sized mason jar waterer grows algae and slime pretty fast, my adult's bucket horizontal nipple waterer (with very thick plastic walls, thicker than a typical bucket) does not. I've literally never cleaned it other than a quick rinse out each time I fill it, and it's perfectly clean inside.
The waterer I use is this one: https://www.backyardchickens.com/reviews/premier-1-heated-poultry-waterer.11903/
In hot temperatures (around 90F+) I do provide additional water via large plant saucers. They're meant for the chickens to stand in to cool off a bit, but of course they'll also drink from them.
Another thing that's important to me in a waterer is to have one that's fully opaque, and to keep it in the shade on top of that. If no light gets in, no algae grows. No algae, no need to clean. My semi translucent chick sized mason jar waterer grows algae and slime pretty fast, my adult's bucket horizontal nipple waterer (with very thick plastic walls, thicker than a typical bucket) does not. I've literally never cleaned it other than a quick rinse out each time I fill it, and it's perfectly clean inside.