S8+ What is the best camera setting. The 16:9 or the 4:3?

I NOTICE THERE ARE NUMEROUS OPTIONS AND THE SETTINGS THAT USES THE MOST PIXELS IS 4:3, BUT IT SEEMS TH 16:9 SETTING USES MOST OF THE SCREEN. I would LIKE TO USE THE CAMERA TO IT'S MAX CAPABILITIES BUT IT SEEMS ODD THE 4:3 SETTING.

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