I only use LilyPond for engraving, and MuseScore for input. They complement each other that way as a free software replacement for the usual commercial options.
The (former, IIRC) product manager for MuseScore (aka @tantacrul) has claimed that he thinks that MuseScore is now doing better engraving than LilyPond. He has a vested interest, obviously, but he's also a smart and conscientious human being.
I’ve tried MuseScore several times over the years and just this year realized that 4 is actually pretty dang good. I haven’t reached for anything in awhile.
