a bike rack isn't going to be tough duty for any of them, so I would go for the one which tucks under your vehicle the best. All of them are pretty similar - until you get into a heavy duty hitch.
About 3-4 years ago, my parents were towing their Saturn car behind their motorhome - with a name-brand factory hitch, when the hitch broke loose and the car went into the ditch. Fortunately they were near home, going very slowly around a corner at the time, and no other traffic was nearby. The car suffered some scratches and some minor damage, but it was nothing compared to what could have been. In the previous 5 years or so they had towed that car more than 50,000 miles behind that motorhome.
I was at their house the next day and took one look at the hitch and was flabberghasted. The receiver tube was welded to the hitch frame with tack welds only - Somebody forgot to put in the structural welds!
So my stepfather finally tracks down the manufacturer, and they were pretty skeptical of the story; they wanted him to send pictures of the failure. When he got the pictures emailed, the head welding instructor and QC guy in the factory called in just a few hours. The guy was apologetic and angry that this thing got out the door of their factory. The hitch company immediately agreed to pay for the damage to the car and replace the hitch and the tow bar from the car that had bent.
They welded up a new "heavy duty hitch" to replace the broken one - the QC guy said he welded it himself and "it won't break" . The new hitch was probably twice as heavy as the old one, the metal was significantly thicker. Not only that, but the fabrication was a work of art, and they had it powder coated. The only thing they asked in return was for my Stepfather to send them the old hitch, for "training purposes", which he did - the guy said he was going to use this as an example of "mistakes that get people hurt" to train all the welders and QC folks.
Anyway, I won't mention the manufacturer - because even though they made a pretty egregious mistake, once it was brought to their attention they did everything they could to make it right.