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Resolution itself doesn't matter much until you watching video on 50-inch TV. As Dp mentioned above, now many phones have "4K" cameras, action-cams too, but thats not true 4K because size of sensor is very small. Few years ago Nokia presents phone with 41-mexapixel camera...lol, any DSLR cam shoots better with their 10-12Mp sensor))

720p is enouth in my opinion for screens up to 20-24 inch
1080p is enouth for most of screens, exept newest big TVs
lower resolutions is for Youtube only