Would teeth whitening be better? Or would veneers be better?

I am concerned because my teeth look yellow overall.

Will teeth whitening make the color sufficiently bright? I am also curious if the whitening effect lasts a long time. If whitening does not yield satisfactory results, would veneers be more effective? I have heard that veneers can improve both color and shape; do they actually look natural? I am also wondering if there are differences in treatment duration and cost. I would like to know which method is more suitable depending on the condition of my teeth.