See how different we all are? I found the Jessie way too small for my needs.
So to me, the most popular and collectible Kooba depends on the person IMO. I love the Lucy, myself personally - it's comfortable, fits lots and is so timeless...but maybe others would find it too big...you know?
I love the Sienna very much - but some might not like the grommets/whipstitching. My friend the other day saw my brown one and had the sweet audacity to say "wow - that looks really medieval." MEDIEVAL? ARE YOU KIDDING ME????
So to each is own, I say.....