We use the same 14l drinkers for our sows and the big 120L black plastic cow drinkers for our grower pens.
We also use the smaller 2.5l metal drinkers for our micropigs. All pipework is run underground to point of use here.
My step-dad had lots of nipple drinkers on his farm but that was mostly brick sties, i worry about using them in the wide open and also less useful during a freeze, once frozen you're stuffed. At least with one of the above drinkers you've got something to manually fill if you need to.