When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Your choice really depends on what you need to fit in it.
I chose the Yakima Rocketbox Pro 11. It is long and narrow thus offers lower aerodynamic drag. Hardly hurts our fuel mileage at all. BUT you cannot fit large suitcases in it. Duffels rule.