Is the 57′ Chevrolet Bel Air better than the 55′ and 56′?

The 57' Chevrolet Bel Air is certainly more sought after by collectors, but I'm a fan of all three classic designs. To a completely untrained eye they look quite similar. Most Chevy fans (and classic car enthusiasts in general) can quickly spot the difference between all three years of the Bel Air.

1955 Chevrolet Bel Air

This is a beautiful 1955 Bel Air.

55 Bel Air

You'll notice that the 55' has the completely horizontal trim on the back quarter panel seperating the upper and lower quarter panel. And, the profile of the rear end is pretty square and drops almost straight down from the tail light to the bumper.

55 Chevy Bel Air tail

Here's a good shot of the rear end of this 55'. 

For the 1956 Bel Air model, a couple things were changed that can easily distinguish it from the others. Here's a 1956 Bel Air:

1956 Chevrolet Bel Air

On this 56' Bel Air, you'll notice that the fender trim piece isn't horizontal. It's curved down towards the lower bumper. Here's another look at the 56':

1956 Chevy Bel Air

You can also notice that on the 56', the trim piece that runs down along the side of the body is much thicker than the previous style, and it is wide enough to allow for a little strip of paint inbetween the chrome. Among some other differences between the two cars is the grill and hood emblem, front turn markers, and front bumper.

In 1957, the design of the Bel Air got tweaked a little more. Here's a 57' Bel Air:

1957 Bel Air

As you can see, the 57' has a different side trim than does the 56' and 55'. The trim on the 57' is a single chorme piece that runs the side of the car, and fans out to the rear end without covering the top of the rear fenders. 

67' Chevy Bel Air

And, unlike the 55' and 56' models, the tail fins on the 57' model have a sharper angle coming back to the tail lights and bumper, creating a much more distinct fin. 

1957 Chevrolet Bel Air

And as you can see, the grill is different from the two previous designs as well.

So – even with these somewhat subtle differences, the 1957 Bel Air has been a much more desired car for classic car enthusiasts and collectors. It would be hard to argue that the 57' looks dramatically better, so why do people seem to like it more? Did they produce fewer of them making them more rare?

Is the 1957 Bel Air better than the 1955 and 1956 Bel Air?