The "curvy" quality you see in the image is an optical distortion called
barrel distortion and it is seen to one degree or another in virtually all ultra-wide angle lenses like the ones used in these two cameras. Certain very expensive lenses are able to minimize these distortions somewhat. The Vico-Opia 2 manages to eliminate the distortion using a digital technique because the camera uses an Ambarella A12 processor that has a feature called geometric distortion correction (also known as de-warping). The A119 camera uses the Novatek NT96660 processor which does not have the feature. For dash cams, the fact is that a "curvy" image doesn't really matter so much as long as you can capture what happens on camera. Since your budget is no more than $100 then cameras such as the Vico-Opia 2 which cost two and a half times as much than a Viofo A119 are out of the question so it may be best to not worry about curvature of field and concentrate on other important factors.
As for the Vico Opia 2 looking "sharper" I'm not so sure. This may be more of an illusion. All digital cameras, especially dash cameras use digital sharpening to some degree. It is common to see some camera manufacturers (or just certain cameras) use too much of this sharpening technique because it gives an impression of greater detail that isn't really there. Digital over-sharpening can actually make the problem worse and you would be better off with a camera that relies more on the len's inherent ability to capture detail more naturally.
Over-sharpening in the camera's firmware causes a white "fringing" effect around objects that looks like a halo. Looking closely at the two compared images you'll see that the Vico image is quite over-sharpened.
Notice the white sharpening halo around ALL the objects in the scene captured by the Vicovation but especially here on the rear windows of the car and under the bridge.
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The A119 has less of this halo because it is not so over-sharpened and the image has a more natural appearance.
Cameras with less over-sharpened images will give you better image capture in the long run, especially over a wide range of lighting and weather conditions.
In my opinion, the A119 is providing a better more detailed image despite the illusion created by the Vico.
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