[mdavej]

I use csv and pdf bookmarks in different situations. Both work well, but adding bookmarks to a pdf is more difficult and requires more effort, at least for me it does. But I make bookmarks in the pdf sometimes because my backup music reading tablet is just a Kindle that can't run mobilesheets. So it's either pdf bookmarks or none at all in that case. 

I have about 20 fakebooks in my library which have mobilesheets song files for every tune as well as one for each whole book. I choose to use a single database for all my music.