How do the visuals on the Nintendo Switch compare to those of the Xbox 360 & PS3?

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DialgaMarine said:
PS3 and 360 would’ve have no problem running games like BotW and SMO. maybe a slightly lower frame rate/ res, but still able.

You'd have to cut more than just resolution and framerate to get those running on PS3/360; RAM footprint would have to be dramatically decreased, which would mean lower resolution textures, decreased quantity and quality of assets, more aggressive LOD. A lot of the newer lighting and effects techniques in Mario would likely also have to be removed/simplified to work on the ancient 2005/2006 era GPUs in PS3/360.