i use the Batignolles Horizontal when i go to school for rehearsals because i can fit all my music in it -- which is really a lot -- and there's still room to my wallet, pencil case, water bottle cell phone, keys and makeup
I have the BV and love it! I chose it over the BH because I thought the BH was a tad bit too wide.
I do love the regular batignolles too...but it is kind of small and definetly more of a handheld bag. It's still on my list though...it's too cute!