Between these two bags, I'd go with the Popincourt Haut. It's very spacious and not as 'restricting' as the Batignolles Vertical with its side gussets. But personally I prefer the Batignolles Horizontal, I'm gon go buy it soon for school!
I had the Popincourt and believe it or not, returned it because those clacking beads drove me nuts! I also didn't care for the zipper hanging way off the bag...I received the BH for Christmas and LOVE it. It doesn't zip, but it is deep enough to put wallet in bottom, but not so deep you can't find anything. I purchased the Cabas Piano because I wanted one that zipped for situations when I wasn't comfortable with just a clasp closing the bag. But between the two you suggested, I say neither! Cabas Piano or PH!
Sorry, got my letters mixed up! Regarding the PH, I meant BH or Cabas Piano! Wrote "PH" instead, which totally went against what I just wrote! Sorry, just woke up from a nap...That will teach me to write pre-coffee...