TLDR - The human vision aspect ratio is less that 16:9 (that's why movies are usually 2.39:1), making 16:9 closer than 16:10. 16:10 is still fine and if you prefer it then go for it. 16:9's are just a more practical solution for the way I use my computer. eatupalready.
Hereare some standard laptop screen resolutions: 16:10 aspect ratio resolutions. 3840×2400; 3072×1920; 2560×1600; 1920×1200; 16:9 aspect ratio resolutions. 2560×1440; 1920×1080; 1600×900; 1366×768; What
Itlooks like the current version of beamer supports aspectratio option. \documentclass [aspectratio=169] {beamer} should do exactly that. Other possible values are: 1610, 149, 54, 43 and 32. By default, it is to 128mm by 96mm (4:3). Ensure that you do not also use \geometry {paperwidth=XX,paperheight=YY} into the same tex file,
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