The white Zoji (NS-WAC10/18) is preferable because when the lid is opened, it springs in a better way. It’s more graceful and natural. They both come with inner pots, though the brown Zoji has an inner pot that smells more strongly of teflon and is thinner.
5 cups is the perfect size. It’s likely you’ll cook for other people, so 3 is too small. 10 is too big for most families, unless you’re cooking for more than 4-5 people a lot.
One annoyance is the fact that the inside is still non-stick, which is toxic. I ordered a stainless steel pot from AliExpress and will report back on it.