How do I pick between DLSS and FSR on my RTX 3070 for best visuals?

[PatrickM]

I'm trying to get the best performance out of a new, demanding game on my RTX 3070. I've been experimenting with the upscaling options, and I'm confused by the results. In my specific game, the dlss vs fsr performance comparison feels really close, but FSR makes some textures look a bit shimmery. Is the visual trade-off usually worth the extra few frames you might get from one over the other, or is it mostly down to personal preference?