Reply To: Vocals with Instrumental Accompaniment for Harmonic Analysis
You could do either open score or piano (all intervals read upward) with solo line.
If you have other pieces (such as the Bach you asked me about) that are in the same volume, I'd use a similar format for each if possible. The important thing is to be consistent. If you have multiple formats, just include a TN before the example saying which format you're using.