The Musician does not have all of the editing and creating tools that Composer has, but if you don't need create your own arrangements from scratch, or add repeats,etc., it will do all you need. You can always uprade quite cheaply if you need more. OOH, Composer is so cheap, what have you to lose.
Speaking only for myself, I use Composer to quickly add lyrics to midi files to play and sing over from lead sheets created. I also create piano parts for my pianist at church, as well as lead sheets for me. Everything prints out as well as scrolls on a pc.
I am not a software person and wanted something without a huge learning curve. There is all kinds of help at the Website, including a forum.
Compare Musician and Composer to see what best fits your needs.
http://www.notation.com/NotationMusician.php