Mia Bag: mix and match

Mia bag made by Monica Bianco. She is creative and innovative stylist. Her collections are influenced by luxury brand such as Hermès, Tiffany, McQueen, etc. She combine timeless fashion and contemporary things (e.g. skulls, hearts, studs, etc.). Look at www.miabag.com, to see her new collection.
I choose that one is mix and match between Hermès Birkin shape and Tiffany hearts, matching with
Louboutin shoes and Tiffany bracelet.

Kelly or Birkin, formal or casual style?

"The Kelly is a touch more formal, a little more appropriate for an evening out, a business dinner, as a more refined look. The Birkin is more sporty, more casual. Often people use it as a briefcase, throw in a change of shoes," says Trina Sams-Manning, manager of the Hermès shop in Fairfax Squar, Virginia (USA).
Kelly's bag was made for the elegant actress Grace Kelly and Birkin one for actress and singer Jane Birkin.  I prefer the Birkin bag even though it is heavy.
The price of these bags is about $6,000 or can top $25,000 depending on hide and hue.
And you, which do you prefer, the Birkin or the Kelly?