While I used to be strictly a sellier Kelly gal, I've totally flipped for my 25cm togo retourne Kelly! It is so casual without compromising the classic beauty of the Kelly shape. I would say this is my fave.
My most functional H is my 35cm potiron GPT. I use it once a week as an overnight bag (it helps to have tiny clothes! LOL!!) on my business trips to Miami.
But, I am dying for a 25cm Birkin in veau swift. Hopefully, I will find one soon!!