I would go for the larger size.
I bought one pair. They are so uncomfortable and the sole is super thin. You can feel the cinders and stones right through the sole. One shoe is a tad wider than the other one.
They are super cute and I loved the style. I should have returned them. I wore them a few times to events where I knew I would be sitting. They are now in my closet collecting dust.
I would suggest you pay for them through PayPal after signing up for their free return program. That way if they don't work out, you will not have to pay for return shipping.