At first I thought the black w/stars... but if that 2nd border is supposed to be the same width as your inner pieced border, then the solid (?) or solid-appearing brown would be fine, esp. if there is some of that brown in the quilt itself. I can't tell... too dark. If it was any wider, it would stick out like a sore thumb (or black eye) and then the black w/stars would appear a bit "softer". I can see that one in the quilt squares.
Good luck... and it does look yummy like chocolates. :-)