Depends where you live, but for me (in the freezing north) it's far easier to use a bucket for water so that I can easily dump it every night. A rubber bucket expands with the ice so that nothing breaks if I forget to empty it. The same cannot be said of the galvanised steel waterer, though admittedly, that might have been a fluke. In the winter, nipple waterers just freeze every hour, on the hour (As I know from my parents' neighbor. I've never owned one.)
If you live in Southern California or Texas, a nipple waterer might be ideal for you because of how well they keep the water clean and how much water you could, potentially, keep inside one depending on what container you use.
I use a rubber pan for chicken feed. The sides are four inches high, and the chickens can't scratch anything out without some real effort on their parts. My dad had a PVC feeder once, and the rooster couldn't eat out of it because of his comb. It was also difficult to empty and attracted rodents.
Mostly, this sort of thing comes down to personal choice, but I would not get a feeder that I cannot empty at night.