I really love both for different reasons but I'd have to go with Sweeney Todd. Maybe it's just because I know it better but I love everything about that movie.

The movie? Les Mis.

The musical? Sweeney.

I'm a Tim and Helena stan, but man, Les Mis was amazing.

Sweeney Todd

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Haven't seen Les Mis but I have listened to the soundtracks of both films and I prefer Sweeney Todd's music. I only liked two songs from the Les Mis soundtrack.
I will get around to watching Les Mis soon.

Music from Les Mis >>>>>