I'm an American, but I use "zed" over "zee" in some contexts (such as ham radio) because "zee" is too easily confusable with the other letters it rhymes with: b

I'm an American, but I use "zed" over "zee" in some contexts (such as ham radio) because "zee" is too easily confusable with the other letters it rhymes with: bee, see, dee, gee, pee, tee. It's definitely an advantage. And you don't have to drop into NATO phonetic with its multiple syllables per letter.