If you have an astigmatism, we would suggest you wear regular sunglasses as it can provide clear vision area when watch through the UV protection coating. The clips may disturb the performance of your prescription lenses to some extent if you have astigmatism.
Kids are not suitable to wear glasses clips. Since they have less strength to ensure the lens safety when they take the clip off from the frame or put it on. The lenses can easily be scratched.
Clip-on glasses are smaller than prescriptions regular glasses, so if you are a oversized glasses fan, then sticking to just the one pair might not be the best choice for you.