Rather watch: Depends on what mood I'm in More serious: Dunno, thats a tough one. Both feature Nazi's and musical numbers which evens everything out. Better art: Can't decide. Both have their merits. Better film: see above
Rather watch: Casablanca
More serious: Casablanca
Better art: Casablanca
Better film: Casablanca
However, The Sound of Music is one of very few musicals that I can actually enjoy.