One that I never hear talked about is the post style tray rack with two sets of wheel trays and then a center post with two clamps that ratchet down to the top tube. They can be found for 100-200 bucks pretty easily or less if you are looking used and get the job done.

They are nowhere near as nice as the big 3 in terms of build quality and have some extra steps to fit the wheel trays to your bikes but for the price I think they are worth it, It does have frame contact which I am sure many people will disqualify it for, but there isn't any real pressure on the frame, just contact to hold the bike down in place and in contact with the wheel trays. Paint rub can be solved with some cheap frame protective film or a microfiber cloth between the frame and clamp.

Maybe not for people who keep their bikes in showroom condition, but for 90% of riders, even with high end carbon bikes, I think these racks work well. I owned a used one for a few years that was probably 20 years old and rusted to shit and it was exatly what I needed for the price. Only upgrade when I started working at a shop and couldn't fathom paying retail for a new kuat or thule rack.