I have the mini (smallest one) and I stack it with my e-ring and/or one of my other wedding bands. I have small fingers (size 4.5) and the classic looked ridiculous on me. I like to collect wedding bands and other small rings... I'm a stacker. Go smaller if you want to stack it and bigger if you want to wear it alone. I would size up, though. It looks a bit tight. It's difficult to roll if you're swollen and it's hot outside if you buy it too small.
Thanks L etoile. Will try the next size up. I’m a size 4 on my ring finger, so good to hear your opinion as a size 4.5 - thank you!!