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Personally, I wouldn't generate new slides at a resolution less than 1920x1080. I wish I could have created all my old slides at a higher resolution and exported them at 1080p. Because now I could re-export at 1440p or 4K At 1080p they don't look bad on a 4K display, but depending on the source material many of my old 480p and 720p slides look awful. So basically I'd create anything new at the highest possible resolution based on available source material and then export at the resolution of my display but keep the originals to update later at a higher resolution. Also, most free upscaling tools I've tried have done a pretty poor job at it, but your mileage may vary.