Can both the ellipsis and/or the em-dash be used in the sentences below to show an abrupt change in mood? Which is the better choice, in your opinion? Sheila said, “I wanted to tell you that . . . oh, never mind.” Sheila said, “I wanted to tell you that—oh, never mind.”
I use both. The main difference is the abruptness issue. If somebody breaks off abruptly, then the dash is probably the right one to choose. If the person trails off in a dreamy fashion, then the ellipsis gives that effect.
