Replying to PHOTOGRAPHERS: shutter speed vs aperature.

I'm a noob photographer. I wouldn't call myself a photographer. But I'm chillin in a parking lot taking pictures of stuff getting acquainted with full Manual. I took two pictures, one with Shutter 1/250 and F36 and one at 1/640 and f22. The pictures look identical and I just tweak these to get the shots I want. But is there a reason you would take one over the other? Or is just getting them to work together to get the shot you want in the conditions you want? Just trying to learn all I can, teach me!