Both are outstanding shows and I have seen both shows multiple times. (LES MIZ -8 and SWEENEY -10)
My choice would be SWEENEY.
SWEENEY tells a more offbeat story, one that could come across as a hoary old melodrama, but through exceptionally complex music and incredibly dense lyrics is transformed into a modern parable.
LES MIZ suffers a bit in translation. The lyrics are more simplistic and don't delve as much into character. The music is appropiately lush and stirring and adds much to the mood of the piece.
LES MIZ underscores one's belief in the good in all men. ("To love another person is to see the face of God") SWEENEY forces us to confront the darkness of our souls. ("To seek revenge may lead to hell/But Everyone does it though seldom as well/ as Sweeney..")
I am not a strongly religious person. I find LES MIZ uplifting but respond more to the black humour and intensity of SWEENEY.
Blue Wizard asks if SUNDAY isn't a better show than SWEENEY. Again comparing two different pieces. SWEENEY is more about plot while SUNDAY explores ideas. And while SUNDAY never fails to move me no matter how many times I see it live (4 times now) or on video (too many times to count), SWEENEY gets my vote as the best because of it's sweeping score, devilishly clever lyrics (which communicate story and character so well), and the fact that is does not have to be elaborately staged to work. Whereas SUNDAY requires a full re-creation of the Seurat painting. This is probably why we see fewer productions of SUNDAY.
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com