Questions about image generation quality

[TimZhang001]

I saw Unet in the code you provided, but when I used Unet for denoising, the image quality (sharpness) I obtained was much worse than using NextNet. What is the reason for this?

I understand that the diversity of images generated using unet is worse than NextNet, but why is the quality of the generated images so much worse?

NextNet

Unet