Styling was unlike prewar car-of-the-future concepts featuring fenders completely merged into the basic body. Instead, GM's styling boss Harley Earl had his team design cars with distinct, applied rear fenders, with the overall fenderline being a short distance below the cars' beltlines. The purpose was to reduce likely visual bulk that slab-sides would create on the comparatively tall cars of the day. That is, Earl's designs were generally graceful.
In my opinion, the best looking of the lot was the Oldsmobile convertible. Of course, convertibles almost always seem more attractive than other body types because they lack passenger compartment greenhouses. Those greenhouses include many items (doorposts, roof profiles, windows, passenger ergonomic considerations, etc.) that stylists have to deal with, including some that make attractive solutions hard to achieve. Convertibles lack all that fuss.
As to why I prefer the Oldsmobile design, let's take a look.
The featured car is a 1948 Oldsmobile Futuramic 98 Convertible, photos via Mecum Auctions.
One can see it, but I find it explaining it difficult. It's just that all the elements work together to create a pleasing whole. Even the the potentially awkward convertible top isn't a distraction.
Those horizontal fender chrome strips are set on the low side, drawing the eye downwards, making the car seem even lower. That rocker panel chrome adds to the effect.
Instrument panel and dashboard. Clutter is near the gauges, not spread around. But all those similar knobs are ergonomically questionable.
Grille design is simple. Roundings echo other rounder body features, reinforcing the theme.
Rear is not cluttered. The convertible top is simple, though the backlight window is too tiny.
Yes, plenty of rounded features. Yet there is a feeling of tautness. And those strong, horizontal fender chrome strips provide a counter to the roundedness.
Left side.
Rear quarter view. Perhaps the most awkward perspective, with the high trunk lid next to the low rear fender.
Again, the canvas top does not detract front the design more than a trifle. Aft ends of the fenders nest the lower part of the trunk lid, adding visual interest.
1948 Cadillac 62 Convertible - car-for-sale photo
Looking at side views of the Olds and the other new C-body convertibles. (By the way, the Oldsmobile grille design is much simpler and better integrated than Cadillac and Buick grilles.) Again we find bold horizontal chrome strips placed at the same level as on the Olds. The Cadillac has decorative chrome abaft of the front wheel opening. Also a character crease across the front fender section. Plus the famous tail fin that seems a little silly-looking here.
1948 Oldsmobile Futuramic 98 Convertible - BaT Auctions photo
Image of another Olds convertible placed here to aid comparisons.
1949 Buick Roadmaster Convertible - car-for-sale photo
The other C-body convertible. This later-in-the-model-year car features the bold "Sweepspear" chrome swath. Its main function proved to be a brand identifier, but adds confusion to the styling. Not nearly as pure a design as the Oldsmobile's.
1949 Buick Super Convertible - car-for-sale photo
Buick Supers and early-1949 Roadmaster convertibles had simpler side trim than seen above: no Sweepspear. Even so, there is more decoration than on the Oldsmobile. Specifically, the "portholes" on the front fender and the chrome strip-plus-turning-signal-light atop it. The "cascading" curves at the aft of the rear fender are interesting, but fussier than Oldsmobile's fender design.