Actually, the EXIF data is available in both embedded images. Your dad's image is taken with a much lower ISO, therefore the image will look cleaner with less noise. The downside is that the image will be darker and appear under-exposed. This is quite apparent when you look at the distant walls where your image is much brighter.
HOWEVER, his image is brighter at the Coke bottle because flash was fired from his camera, while it wasn't on yours. I can't be 100% certain about this, but there is a very bright light reflecting off the Coke bottle in his image which I'm guessing came from the flash. Another clue is that in your picture the label on the other side of the Coke bottle can be seen, while on his image you can only see the white insides.
Having said that, I generally prefer to avoid using flash if possible. Introducing artificial light source can make the image look less realistic. The downside is that higher ISO will be used and the image will be noisier. If you can hold your camera steady, you can use manual setting to force a lower ISO to be used.
Dad's EXIF:
Shutter speed: 1/30
ISO: 100
Your EXIF:
Shutter: 1/26
ISO: 400