4:3 stretched aspect ratio has the same field of view as 4:3 aspect ratio. The view is simply stretched to the sides and gives the image a wider look. This makes the players appear fatter and small gaps appear wider. This does not mean the players are easier to hit, but it does give you a small visual advantage, as the players will be easier to spot. If you change your resolution to stretched, you will notice that your crosshair movement might feel a bit weird. This is because the width appears wider than it actually is. Therefore your crosshair will seem to move faster horizontally than vertically. But as with everything else in Counter-Strike, it only takes some practice to get used to. When choosing the stretched resolution you should also be wary of the enemies peeking feeling faster. If you are new to CS:GO you might not know what “peeking” refers to, but don’t worry we will get into that later.
The 16:9 aspect ratio is your native resolution which you will be given by default when playing the game for the first time. My best advice when it comes to resolutions is to stick with the one you have. Don’t change because a pro player hit a good shot with a different resolution to yours. The picture beneath gives you an illustration of the real difference between stretched and native resolution.