it really varies on what kind of car/vehicle you plan on using your bike rack for.
I currently use a Thule (hitch mounted), and that is all I have ever used. You pay the price up front, but what you get out of it you really can not put a price on. The first one I had I used for 10+ years on MANY trips and it took a beating, and now the one we have is great. I have the T2 Classic w/ 4 racks on it. It is durable, has locks, and you can easily access any of the 4 bikes.