It's a matter of personal taste.. I think all the 81's looks great
I love an all red 81a, they look great,
but I also love the 81b or D with the two tone and stainless seperator..
I agree with an earlier comment, that if you are setting out to collect one of all 4 flavors of the VMC models, then a Coke 81D is what you'll want so they all have large doors on them..
I've sold and restored some 81a's for customers who wanted them two toned as well.. so yes, Most customers who want a vintage coke machine for they game room, classic car garage etc.. want the classic two toned, and most of them don't care what model it is. just want it red/white..
an 81 is still just cool machine no matter what color, style or brand in my opionion..