I had to go back to your most recent pix ... all I could remember for sure was the stubborn little boy!
From the ones you posted a couple days ago, I'd have to say Rolly. She seems the most animated. BUT ... that might not be a good thing if you're hoping for a laidback dog. It's really difficult to make that call just from their pix though!
They are all really beautiful. i would probably keep the boy because we've always had boy Yorkies!