Oh dear. Not sure whether I am able to answer this
very relevant question

.
Last week it was Anchor Grey Sheen, 4th from the left.
Today it was Bordeaux Tuscania, 6th from the left.
When it comes to these bags, I appear to be very fickle

. Loving whichever one I am wearing above all the others

.
I
can however narrow it down to leather type,- best Calistas are (in
my opinion and experience) in Merinos, Sheen and Tuscania.
Soft, thin, drapey leathers....
1st and 3rd from the left are in Veronas, a thicker leather, and they don't drape well if the load is too light. I expect the same would apply to Pebbled, Cuoio Toscano or Nappa...