I use Noteworthy and like it, but I have nothing to compare it with. I don't make any complicated demands on it, I just want to write out singel melody lines, but they say it will do several instruments and clefs. You can insert changes of tempo, and alter the tempo for playback. You can transpose, and the new Version 2 actually makes a "ping!" of the correct pitch on the note as you type it in.

You can try it for free (I think) if you download the free Noteworthy Player, although this limits the amount of editing you can do on any one score.

It is a lot less sophisticated than something like Sibelius, but also a lot cheaper.

Marje