Good morning;
While there are obvious differences in what each person uses as their "normal" lens, there can be actual optical characteristics that may influence that decision.
For me, I use a 58 mm focal length lens.
Why? Because I have found that particular focal length to match my own perspective with my eyes.
With a 58 mm lens, if I look through the camera view finder and note "where things are," when I look up at the scene with my eyes, nothing moves. Everything stays in the same place. If I put a 50 mm lens on the camera and repeat the process, things move when I shift my eye. This is especially noticeable on the sides of the viewfinder. When I look up, things on the side of the frame move out even more with a 50 mm lens. No, they do not move out as much as with a 35 mm lens, but they do move. With a 58 mm lens, everything stays in the same place. To me, that is "true perspective."
If you have access to these focal lengths, try it on your camera and see what you get.
Back when Nippon Kogaku came out with their Nikon F, their first fast standard lens for the F was the Nikkor-S Auto 1:1.4 f=5.8 cm. When Minolta came out with their first serious 35 mm SLR lens, it was also a 58 mm; the Auto Rokkor-PF f=58 mm 1:1.4. I believe that the optical engineers in both of the two companies in Japan who made their own optical glass had a reason for choosing 58 mm for their first serious professional low light level lens for a single lens reflex camera. I believe that reason is the true perspective this focal length provides in comparison with the vision of the human eye.
While there are obvious differences in what each person uses as their "normal" lens, there can be actual optical characteristics that may influence that decision.
For me, I use a 58 mm focal length lens.
Why? Because I have found that particular focal length to match my own perspective with my eyes.
With a 58 mm lens, if I look through the camera view finder and note "where things are," when I look up at the scene with my eyes, nothing moves. Everything stays in the same place. If I put a 50 mm lens on the camera and repeat the process, things move when I shift my eye. This is especially noticeable on the sides of the viewfinder. When I look up, things on the side of the frame move out even more with a 50 mm lens. No, they do not move out as much as with a 35 mm lens, but they do move. With a 58 mm lens, everything stays in the same place. To me, that is "true perspective."
If you have access to these focal lengths, try it on your camera and see what you get.
Back when Nippon Kogaku came out with their Nikon F, their first fast standard lens for the F was the Nikkor-S Auto 1:1.4 f=5.8 cm. When Minolta came out with their first serious 35 mm SLR lens, it was also a 58 mm; the Auto Rokkor-PF f=58 mm 1:1.4. I believe that the optical engineers in both of the two companies in Japan who made their own optical glass had a reason for choosing 58 mm for their first serious professional low light level lens for a single lens reflex camera. I believe that reason is the true perspective this focal length provides in comparison with the vision of the human eye.